<?xml version="1.0" encoding="US-ASCII"?>
<!--XBRL Document Created with Wdesk from Workiva-->
<!-- -->
<link:linkbase xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <link:roleRef roleURI="http://www.abm.com/role/Acquisitions" xlink:href="abm-20180131.xsd#Acquisitions" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/AcquisitionsGcaConsiderationTransferredDetails" xlink:href="abm-20180131.xsd#AcquisitionsGcaConsiderationTransferredDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/AcquisitionsGcaPreliminaryPurchasePriceAllocationDetails" xlink:href="abm-20180131.xsd#AcquisitionsGcaPreliminaryPurchasePriceAllocationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/AcquisitionsGcaProFormaFinancialInformationDetails" xlink:href="abm-20180131.xsd#AcquisitionsGcaProFormaFinancialInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/AcquisitionsOther2017AcquisitionsDetails" xlink:href="abm-20180131.xsd#AcquisitionsOther2017AcquisitionsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/AcquisitionsTables" xlink:href="abm-20180131.xsd#AcquisitionsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/AuctionRateSecurities" xlink:href="abm-20180131.xsd#AuctionRateSecurities" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/AuctionRateSecuritiesNarrativeDetails" xlink:href="abm-20180131.xsd#AuctionRateSecuritiesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/AuctionRateSecuritiesSignificantAssumptionsUsedToDetermineFairValueOfAuctionRateSecuritiesDetails" xlink:href="abm-20180131.xsd#AuctionRateSecuritiesSignificantAssumptionsUsedToDetermineFairValueOfAuctionRateSecuritiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/AuctionRateSecuritiesTables" xlink:href="abm-20180131.xsd#AuctionRateSecuritiesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/BasisOfPresentationAndSignificantAccountingPolicies" xlink:href="abm-20180131.xsd#BasisOfPresentationAndSignificantAccountingPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/BasisOfPresentationAndSignificantAccountingPoliciesGovernmentServicesDetails" xlink:href="abm-20180131.xsd#BasisOfPresentationAndSignificantAccountingPoliciesGovernmentServicesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/BasisOfPresentationAndSignificantAccountingPoliciesManagementReimbursementRevenueDetails" xlink:href="abm-20180131.xsd#BasisOfPresentationAndSignificantAccountingPoliciesManagementReimbursementRevenueDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/BasisOfPresentationAndSignificantAccountingPoliciesPolicies" xlink:href="abm-20180131.xsd#BasisOfPresentationAndSignificantAccountingPoliciesPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/BasisOfPresentationAndSignificantAccountingPoliciesTables" xlink:href="abm-20180131.xsd#BasisOfPresentationAndSignificantAccountingPoliciesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/CommitmentsAndContingencies" xlink:href="abm-20180131.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/CommitmentsAndContingenciesNarrativeDetails" xlink:href="abm-20180131.xsd#CommitmentsAndContingenciesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/CompanyAndNatureOfOperations" xlink:href="abm-20180131.xsd#CompanyAndNatureOfOperations" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/CompanyAndNatureOfOperationsNarrativeDetails" xlink:href="abm-20180131.xsd#CompanyAndNatureOfOperationsNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/ConsolidatedBalanceSheetsUnaudited" xlink:href="abm-20180131.xsd#ConsolidatedBalanceSheetsUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" xlink:href="abm-20180131.xsd#ConsolidatedBalanceSheetsUnauditedParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/ConsolidatedStatementsOfCashFlowsUnaudited" xlink:href="abm-20180131.xsd#ConsolidatedStatementsOfCashFlowsUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/ConsolidatedStatementsOfComprehensiveIncomeLossUnaudited" xlink:href="abm-20180131.xsd#ConsolidatedStatementsOfComprehensiveIncomeLossUnaudited" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/ConsolidatedStatementsOfComprehensiveIncomeLossUnauditedParenthetical" xlink:href="abm-20180131.xsd#ConsolidatedStatementsOfComprehensiveIncomeLossUnauditedParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/CreditFacility" xlink:href="abm-20180131.xsd#CreditFacility" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/CreditFacilityCreditFacilityInformationDetails" xlink:href="abm-20180131.xsd#CreditFacilityCreditFacilityInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/CreditFacilityInterestRateSwapsDetails" xlink:href="abm-20180131.xsd#CreditFacilityInterestRateSwapsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/CreditFacilityNarrativeDetails" xlink:href="abm-20180131.xsd#CreditFacilityNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/CreditFacilityTables" xlink:href="abm-20180131.xsd#CreditFacilityTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/CreditFacilityTermLoanMaturitiesDetails" xlink:href="abm-20180131.xsd#CreditFacilityTermLoanMaturitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/DocumentAndEntityInformation" xlink:href="abm-20180131.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/FairValueOfFinancialInstruments" xlink:href="abm-20180131.xsd#FairValueOfFinancialInstruments" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/FairValueOfFinancialInstrumentsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" xlink:href="abm-20180131.xsd#FairValueOfFinancialInstrumentsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/FairValueOfFinancialInstrumentsTables" xlink:href="abm-20180131.xsd#FairValueOfFinancialInstrumentsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/IncomeTaxes" xlink:href="abm-20180131.xsd#IncomeTaxes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/IncomeTaxesNarrativeDetails" xlink:href="abm-20180131.xsd#IncomeTaxesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/Insurance" xlink:href="abm-20180131.xsd#Insurance" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/InsuranceInstrumentsUsedToCollateralizeInsuranceObligationsDetails" xlink:href="abm-20180131.xsd#InsuranceInstrumentsUsedToCollateralizeInsuranceObligationsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/InsuranceInsuranceRelatedBalancesAndActivityDetails" xlink:href="abm-20180131.xsd#InsuranceInsuranceRelatedBalancesAndActivityDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/InsuranceNarrativeDetails" xlink:href="abm-20180131.xsd#InsuranceNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/InsuranceTables" xlink:href="abm-20180131.xsd#InsuranceTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/NetIncomePerCommonShare" xlink:href="abm-20180131.xsd#NetIncomePerCommonShare" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/NetIncomePerCommonShareAntiDilutiveOutstandingStockAwardsIssuedUnderShareBasedCompensationPlansDetails" xlink:href="abm-20180131.xsd#NetIncomePerCommonShareAntiDilutiveOutstandingStockAwardsIssuedUnderShareBasedCompensationPlansDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/NetIncomePerCommonShareCalculationsOfBasicAndDilutedNetIncomePerCommonShareDetails" xlink:href="abm-20180131.xsd#NetIncomePerCommonShareCalculationsOfBasicAndDilutedNetIncomePerCommonShareDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/NetIncomePerCommonShareTables" xlink:href="abm-20180131.xsd#NetIncomePerCommonShareTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/RestructuringAndRelatedCosts" xlink:href="abm-20180131.xsd#RestructuringAndRelatedCosts" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/RestructuringAndRelatedCostsCumulativeRestructuringAndRelatedChargesDetails" xlink:href="abm-20180131.xsd#RestructuringAndRelatedCostsCumulativeRestructuringAndRelatedChargesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/RestructuringAndRelatedCostsRestructuringAndRelatedLiabilitiesDetails" xlink:href="abm-20180131.xsd#RestructuringAndRelatedCostsRestructuringAndRelatedLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/RestructuringAndRelatedCostsTables" xlink:href="abm-20180131.xsd#RestructuringAndRelatedCostsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/SegmentInformation" xlink:href="abm-20180131.xsd#SegmentInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/SegmentInformationFinancialInformationByReportableSegmentDetails" xlink:href="abm-20180131.xsd#SegmentInformationFinancialInformationByReportableSegmentDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/SegmentInformationTables" xlink:href="abm-20180131.xsd#SegmentInformationTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.abm.com/role/SubsequentEvents" xlink:href="abm-20180131.xsd#SubsequentEvents" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member" xlink:type="simple" />
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension" xlink:type="simple" />
  <link:definitionLink xlink:role="http://www.abm.com/role/Acquisitions" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/AcquisitionsGcaConsiderationTransferredDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableLineItems_959330CB544C299D4CA9F43F3332EE3A" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionEquityInterestIssuedOrIssuableTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionEquityInterestIssuedOrIssuableTable_81484FB2E9CCF991D8A7F43F3323E144" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableLineItems_959330CB544C299D4CA9F43F3332EE3A" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionEquityInterestIssuedOrIssuableTable_81484FB2E9CCF991D8A7F43F3323E144" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_4EDED8C19261F2F77F7CF43F33244426" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionEquityInterestIssuedOrIssuableTable_81484FB2E9CCF991D8A7F43F3323E144" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_4EDED8C19261F2F77F7CF43F33244426" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2EC28B31864C6E4F0DA7F43F33257287_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_4EDED8C19261F2F77F7CF43F33244426" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2EC28B31864C6E4F0DA7F43F33257287_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2EC28B31864C6E4F0DA7F43F33257287" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_4EDED8C19261F2F77F7CF43F33244426" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2EC28B31864C6E4F0DA7F43F33257287" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_GCAHoldingCorp.Member" xlink:label="loc_abm_GCAHoldingCorp.Member_943135AD76167E5AD3A8F440CBA75904" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_2EC28B31864C6E4F0DA7F43F33257287" xlink:to="loc_abm_GCAHoldingCorp.Member_943135AD76167E5AD3A8F440CBA75904" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquityInterestIssuedOrIssuableByTypeAxis" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_434888CCEC34A71FD4ADF43F332504DA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionEquityInterestIssuedOrIssuableTable_81484FB2E9CCF991D8A7F43F3323E144" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_434888CCEC34A71FD4ADF43F332504DA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_E2AFFBD536631DD6D5E4F43F332CFC48_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_434888CCEC34A71FD4ADF43F332504DA" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_E2AFFBD536631DD6D5E4F43F332CFC48_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquityInterestIssuedOrIssuableTypeDomain" xlink:label="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_E2AFFBD536631DD6D5E4F43F332CFC48" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableByTypeAxis_434888CCEC34A71FD4ADF43F332504DA" xlink:to="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_E2AFFBD536631DD6D5E4F43F332CFC48" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_0312AC5D4FA473977F68F440CA745D87" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityInterestIssuedOrIssuableTypeDomain_E2AFFBD536631DD6D5E4F43F332CFC48" xlink:to="loc_us-gaap_CommonStockMember_0312AC5D4FA473977F68F440CA745D87" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_9CB83A94D72527EA5B6EF440C90183F0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableLineItems_959330CB544C299D4CA9F43F3332EE3A" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_9CB83A94D72527EA5B6EF440C90183F0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionSharePrice" xlink:label="loc_us-gaap_BusinessAcquisitionSharePrice_FB37094E1BBDECB6F1DBF440CC5D8629" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableLineItems_959330CB544C299D4CA9F43F3332EE3A" xlink:to="loc_us-gaap_BusinessAcquisitionSharePrice_FB37094E1BBDECB6F1DBF440CC5D8629" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_E910C1EB0B957C892645F440CE8DB079" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableLineItems_959330CB544C299D4CA9F43F3332EE3A" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_E910C1EB0B957C892645F440CE8DB079" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_5C77F4577830326119EDF440D072695C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableLineItems_959330CB544C299D4CA9F43F3332EE3A" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_5C77F4577830326119EDF440D072695C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_1EF29E2A037D535C8F73F440D3BB59C3" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableLineItems_959330CB544C299D4CA9F43F3332EE3A" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_1EF29E2A037D535C8F73F440D3BB59C3" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/AcquisitionsGcaPreliminaryPurchasePriceAllocationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_07F33DA9F0A65DA24682F84EB34422D2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_07F33DA9F0A65DA24682F84EB34422D2" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_5FF0A269A9338101F7F2F84EB345B94C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_07F33DA9F0A65DA24682F84EB34422D2" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_5FF0A269A9338101F7F2F84EB345B94C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6446BC032880025F7137F84EB345CA56_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_5FF0A269A9338101F7F2F84EB345B94C" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6446BC032880025F7137F84EB345CA56_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6446BC032880025F7137F84EB345CA56" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_5FF0A269A9338101F7F2F84EB345B94C" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6446BC032880025F7137F84EB345CA56" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_GCAHoldingCorp.Member" xlink:label="loc_abm_GCAHoldingCorp.Member_F808E9C19F4ECF627239F84EB345976E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6446BC032880025F7137F84EB345CA56" xlink:to="loc_abm_GCAHoldingCorp.Member_F808E9C19F4ECF627239F84EB345976E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_40CE0283EF76C57B7EB6F84EB345B0DD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_07F33DA9F0A65DA24682F84EB34422D2" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_40CE0283EF76C57B7EB6F84EB345B0DD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_3D3F1D745B9836704FDCF84EB345DC0B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_40CE0283EF76C57B7EB6F84EB345B0DD" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_3D3F1D745B9836704FDCF84EB345DC0B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_3D3F1D745B9836704FDCF84EB345DC0B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_40CE0283EF76C57B7EB6F84EB345B0DD" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_3D3F1D745B9836704FDCF84EB345DC0B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CustomerRelationshipsMember" xlink:label="loc_us-gaap_CustomerRelationshipsMember_7DEC9E948E5EC334AF35F84EB3453D49" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_3D3F1D745B9836704FDCF84EB345DC0B" xlink:to="loc_us-gaap_CustomerRelationshipsMember_7DEC9E948E5EC334AF35F84EB3453D49" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TradeNamesMember" xlink:label="loc_us-gaap_TradeNamesMember_E6A833AE9133CEF6C520F84EB34587A1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_3D3F1D745B9836704FDCF84EB345DC0B" xlink:to="loc_us-gaap_TradeNamesMember_E6A833AE9133CEF6C520F84EB34587A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_D9291929B2C39D7FDFA4F84EB3452E73" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_D9291929B2C39D7FDFA4F84EB3452E73" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCashAndCashEquivalents" xlink:label="loc_abm_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCashAndCashEquivalents_03F38E7837C2B1681299F86CD5D69CC0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_abm_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCashAndCashEquivalents_03F38E7837C2B1681299F86CD5D69CC0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_72AFF7E70BE29EF520F6F84EB34669A6" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_72AFF7E70BE29EF520F6F84EB34669A6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_7E68C7794E1CB958AD80F84EB346C547" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets_7E68C7794E1CB958AD80F84EB346C547" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_B0F6BA313898AA5298C8F84EB3466584" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_B0F6BA313898AA5298C8F84EB3466584" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_6F2E95F59BC3CBF45643F84EB3460E89" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles_6F2E95F59BC3CBF45643F84EB3460E89" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles" xlink:label="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles_6E7119D5E6E1E30D7038F84EB34646A4" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIntangibles_6E7119D5E6E1E30D7038F84EB34646A4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_Goodwill" xlink:label="loc_us-gaap_Goodwill_5357F000702F45FDA4FCF84EB3468B13" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_us-gaap_Goodwill_5357F000702F45FDA4FCF84EB3468B13" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_8F8EE67D5D4483C5631CF84EB3464E43" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_8F8EE67D5D4483C5631CF84EB3464E43" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_B2CFB97828E4A8B7E045F84EB3466113" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_B2CFB97828E4A8B7E045F84EB3466113" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_D114374678B060E54C5BF84EB346BA04" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayable_D114374678B060E54C5BF84EB346BA04" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedInsuranceReserves" xlink:label="loc_abm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedInsuranceReserves_EBB48600404E55E58F46F84EB34679B6" xlink:type="locator" />
    <link:definitionArc order="12" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_abm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedInsuranceReserves_EBB48600404E55E58F46F84EB34679B6" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentLiabilitiesIncomeTaxesPayable" xlink:label="loc_abm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentLiabilitiesIncomeTaxesPayable_82B1E2B0362831946ABAF84EB3461075" xlink:type="locator" />
    <link:definitionArc order="13" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_abm_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedCurrentLiabilitiesIncomeTaxesPayable_82B1E2B0362831946ABAF84EB3461075" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIncomeTaxesPayable" xlink:label="loc_abm_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIncomeTaxesPayable_5CBF1FE602142D67E34CF86D97F2824D" xlink:type="locator" />
    <link:definitionArc order="14" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_abm_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentIncomeTaxesPayable_5CBF1FE602142D67E34CF86D97F2824D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_8CD5FD1A0BC94940AFCDF84EB3462777" xlink:type="locator" />
    <link:definitionArc order="15" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther_8CD5FD1A0BC94940AFCDF84EB3462777" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccruedLiabilities" xlink:label="loc_abm_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccruedLiabilities_A7CAB2637E9E67286119F84EB346D9EE" xlink:type="locator" />
    <link:definitionArc order="16" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_abm_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccruedLiabilities_A7CAB2637E9E67286119F84EB346D9EE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_18E028AA19BB3CB90AECF84EB34605B0" xlink:type="locator" />
    <link:definitionArc order="17" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilities_18E028AA19BB3CB90AECF84EB34605B0" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredIncomeTaxLiabilities" xlink:label="loc_abm_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredIncomeTaxLiabilities_87CE92B75CBD5F4C9AFBF84EB3466E84" xlink:type="locator" />
    <link:definitionArc order="18" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_abm_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDeferredIncomeTaxLiabilities_87CE92B75CBD5F4C9AFBF84EB3466E84" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_F885578F61DE6385F882F84EB347AB59" xlink:type="locator" />
    <link:definitionArc order="19" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther_F885578F61DE6385F882F84EB347AB59" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_97E2D356C9D84A3C802CF84EB3475DFE" xlink:type="locator" />
    <link:definitionArc order="20" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_97E2D356C9D84A3C802CF84EB3475DFE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationAcquiredReceivablesAbstract" xlink:label="loc_us-gaap_BusinessCombinationAcquiredReceivablesAbstract_4F2B2237678FC4608FC8F84EB347CCD9" xlink:type="locator" />
    <link:definitionArc order="21" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_us-gaap_BusinessCombinationAcquiredReceivablesAbstract_4F2B2237678FC4608FC8F84EB347CCD9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount" xlink:label="loc_us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount_4AD53D06BD96797411C5F84EB347F5AC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationAcquiredReceivablesAbstract_4F2B2237678FC4608FC8F84EB347CCD9" xlink:to="loc_us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount_4AD53D06BD96797411C5F84EB347F5AC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible" xlink:label="loc_us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible_78FC26288CDD04D9EC00F84EB34C1E90" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationAcquiredReceivablesAbstract_4F2B2237678FC4608FC8F84EB347CCD9" xlink:to="loc_us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible_78FC26288CDD04D9EC00F84EB34C1E90" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGrossAbstract" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGrossAbstract_892EA228D4F347F88849F84EB34C8170" xlink:type="locator" />
    <link:definitionArc order="22" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B3E6838997CE65604064F84EB3454D5A" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGrossAbstract_892EA228D4F347F88849F84EB34C8170" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_4F566876A289F6472977F84EB34CEF48" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsGrossAbstract_892EA228D4F347F88849F84EB34C8170" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_4F566876A289F6472977F84EB34CEF48" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/AcquisitionsGcaProFormaFinancialInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentLineItems_7DF2EF3C2496412839E2F4891359AEB6" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentsTable" xlink:label="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentsTable_A755D85E9C084C4C1582F489135962D8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentLineItems_7DF2EF3C2496412839E2F4891359AEB6" xlink:to="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentsTable_A755D85E9C084C4C1582F489135962D8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_7F157F5F527941B01F7FF489939FDB76" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentsTable_A755D85E9C084C4C1582F489135962D8" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_7F157F5F527941B01F7FF489939FDB76" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_30B37A7669F7D5D99BE3F48993A0AE34_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_7F157F5F527941B01F7FF489939FDB76" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_30B37A7669F7D5D99BE3F48993A0AE34_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_30B37A7669F7D5D99BE3F48993A0AE34" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_7F157F5F527941B01F7FF489939FDB76" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_30B37A7669F7D5D99BE3F48993A0AE34" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_GCAHoldingCorp.Member" xlink:label="loc_abm_GCAHoldingCorp.Member_F1CBAF7EE0C82D85B701F4899440CBB8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_30B37A7669F7D5D99BE3F48993A0AE34" xlink:to="loc_abm_GCAHoldingCorp.Member_F1CBAF7EE0C82D85B701F4899440CBB8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_0BD2099A1E7702AA72CDF4929B27C124" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentLineItems_7DF2EF3C2496412839E2F4891359AEB6" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_0BD2099A1E7702AA72CDF4929B27C124" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_B34E65F5BF399429124CF49378EF6FFE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentLineItems_7DF2EF3C2496412839E2F4891359AEB6" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual_B34E65F5BF399429124CF49378EF6FFE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaRevenue" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_F614388112608BD866A5F48991FED65B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentLineItems_7DF2EF3C2496412839E2F4891359AEB6" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaRevenue_F614388112608BD866A5F48991FED65B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax" xlink:label="loc_us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax_FFB25A23B460D93ED743F489953DD6F7" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentLineItems_7DF2EF3C2496412839E2F4891359AEB6" xlink:to="loc_us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax_FFB25A23B460D93ED743F489953DD6F7" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_BusinessAcquisitionProFormaStatutoryTaxRate" xlink:label="loc_abm_BusinessAcquisitionProFormaStatutoryTaxRate_138B294F884C217586EDF49077BB2DD9" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionProFormaInformationNonrecurringAdjustmentLineItems_7DF2EF3C2496412839E2F4891359AEB6" xlink:to="loc_abm_BusinessAcquisitionProFormaStatutoryTaxRate_138B294F884C217586EDF49077BB2DD9" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/AcquisitionsOther2017AcquisitionsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionLineItems" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_B677204A960ED80B2DB5F3F2A7CB5E02" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_D26083086DF74EB0A5A8F3F2A7CBB679" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B677204A960ED80B2DB5F3F2A7CB5E02" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_D26083086DF74EB0A5A8F3F2A7CBB679" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_846FADCA263021FEA802F3F2A7CB892B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_D26083086DF74EB0A5A8F3F2A7CBB679" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_846FADCA263021FEA802F3F2A7CB892B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_E08B7B4632F6E40EDBA5F3F2A7CB3AEB_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_846FADCA263021FEA802F3F2A7CB892B" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_E08B7B4632F6E40EDBA5F3F2A7CB3AEB_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_E08B7B4632F6E40EDBA5F3F2A7CB3AEB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_846FADCA263021FEA802F3F2A7CB892B" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_E08B7B4632F6E40EDBA5F3F2A7CB3AEB" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_MechanicalSolutionsIncMember" xlink:label="loc_abm_MechanicalSolutionsIncMember_CD8EDA3042DD341B6313F3F2A7CBB98D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_E08B7B4632F6E40EDBA5F3F2A7CB3AEB" xlink:to="loc_abm_MechanicalSolutionsIncMember_CD8EDA3042DD341B6313F3F2A7CBB98D" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_OFJConnectionsLtdMember" xlink:label="loc_abm_OFJConnectionsLtdMember_37D41D0526E8C9BB5869F3F2A7CBD2C7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_E08B7B4632F6E40EDBA5F3F2A7CB3AEB" xlink:to="loc_abm_OFJConnectionsLtdMember_37D41D0526E8C9BB5869F3F2A7CBD2C7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_AAF6BD926040743BA743F3F2A7CB5F06" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B677204A960ED80B2DB5F3F2A7CB5E02" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_AAF6BD926040743BA743F3F2A7CB5F06" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_67997E64C2CA33214640F3F2A7CB5DB3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_B677204A960ED80B2DB5F3F2A7CB5E02" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_67997E64C2CA33214640F3F2A7CB5DB3" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/AcquisitionsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/AuctionRateSecurities" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/AuctionRateSecuritiesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_BF32FBCD6AEAEF3C1734F3F2A75EE961" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_1C9C72A4F9FA57C58C36F3F2A75E6872" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_BF32FBCD6AEAEF3C1734F3F2A75EE961" xlink:to="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_1C9C72A4F9FA57C58C36F3F2A75E6872" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueByAssetClassAxis" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_D9508FA2C20C864ADF92F3F2A75E17CF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_1C9C72A4F9FA57C58C36F3F2A75E6872" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_D9508FA2C20C864ADF92F3F2A75E17CF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_C111BEC11602700706E4F3F2A75EFE6E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_D9508FA2C20C864ADF92F3F2A75E17CF" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_C111BEC11602700706E4F3F2A75EFE6E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_C111BEC11602700706E4F3F2A75EFE6E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_D9508FA2C20C864ADF92F3F2A75E17CF" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_C111BEC11602700706E4F3F2A75EFE6E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AuctionRateSecuritiesMember" xlink:label="loc_us-gaap_AuctionRateSecuritiesMember_F2D9C154F72662B8C143F3F2A75EDDBF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_C111BEC11602700706E4F3F2A75EFE6E" xlink:to="loc_us-gaap_AuctionRateSecuritiesMember_F2D9C154F72662B8C143F3F2A75EDDBF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_CB06FA192C8ED5AD6B21F3F2A75E2310" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_1C9C72A4F9FA57C58C36F3F2A75E6872" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_CB06FA192C8ED5AD6B21F3F2A75E2310" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_E48CA357FDF50AFB95A0F3F2A75E13B8_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_CB06FA192C8ED5AD6B21F3F2A75E2310" xlink:to="loc_us-gaap_EquityComponentDomain_E48CA357FDF50AFB95A0F3F2A75E13B8_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_E48CA357FDF50AFB95A0F3F2A75E13B8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_CB06FA192C8ED5AD6B21F3F2A75E2310" xlink:to="loc_us-gaap_EquityComponentDomain_E48CA357FDF50AFB95A0F3F2A75E13B8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_6AFA8071871FC13953E8F3F2A75EE095" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_E48CA357FDF50AFB95A0F3F2A75E13B8" xlink:to="loc_us-gaap_RetainedEarningsMember_6AFA8071871FC13953E8F3F2A75EE095" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_NumberOfFinancialInstitution" xlink:label="loc_abm_NumberOfFinancialInstitution_806735751EB7EFC859E1F3F2A75EA6A0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_BF32FBCD6AEAEF3C1734F3F2A75EE961" xlink:to="loc_abm_NumberOfFinancialInstitution_806735751EB7EFC859E1F3F2A75EA6A0" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_AvailableforsaleDebtSecuritiesOriginalPrincipalAmount" xlink:label="loc_abm_AvailableforsaleDebtSecuritiesOriginalPrincipalAmount_BAC921C1305EF3921593F3F2A75E2D66" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_BF32FBCD6AEAEF3C1734F3F2A75EE961" xlink:to="loc_abm_AvailableforsaleDebtSecuritiesOriginalPrincipalAmount_BAC921C1305EF3921593F3F2A75E2D66" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_3539D9A38A3867C66468F3F2A75EFDF3" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_BF32FBCD6AEAEF3C1734F3F2A75EE961" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis_3539D9A38A3867C66468F3F2A75EFDF3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecuritiesDebtSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_57A87EB07BE337470D60F3F2A75E0FC1" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_BF32FBCD6AEAEF3C1734F3F2A75EE961" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtSecurities_57A87EB07BE337470D60F3F2A75E0FC1" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_InterestRateResetInterval" xlink:label="loc_abm_InterestRateResetInterval_31816D21162CDE218E2DF3F2A75E755F" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_BF32FBCD6AEAEF3C1734F3F2A75EE961" xlink:to="loc_abm_InterestRateResetInterval_31816D21162CDE218E2DF3F2A75E755F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_EA35A3EE944315AE1B21F4F833937B0E" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_BF32FBCD6AEAEF3C1734F3F2A75EE961" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_EA35A3EE944315AE1B21F4F833937B0E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld" xlink:label="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld_8C081766A61E8454075EF3F2A75E1EC5" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_BF32FBCD6AEAEF3C1734F3F2A75EE961" xlink:to="loc_us-gaap_OtherThanTemporaryImpairmentCreditLossesRecognizedInEarningsCreditLossesOnDebtSecuritiesHeld_8C081766A61E8454075EF3F2A75E1EC5" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/AuctionRateSecuritiesSignificantAssumptionsUsedToDetermineFairValueOfAuctionRateSecuritiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_75F0EDCFA8835D1781F009A9092D606A" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfAvailableForSaleSecuritiesTable" xlink:label="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_079E4EF9D9BA52A3850510074E0D199E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_75F0EDCFA8835D1781F009A9092D606A" xlink:to="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_079E4EF9D9BA52A3850510074E0D199E" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_24B5096DF91550C48C950F2EBA29EE01" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesTable_079E4EF9D9BA52A3850510074E0D199E" xlink:to="loc_us-gaap_RangeAxis_24B5096DF91550C48C950F2EBA29EE01" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_13DA4D27EA053C2E152B58588B60828E_0BDACEF9E3385801B79538849520098F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_24B5096DF91550C48C950F2EBA29EE01" xlink:to="loc_us-gaap_RangeMember_13DA4D27EA053C2E152B58588B60828E_0BDACEF9E3385801B79538849520098F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_AA04512247D456F386816C9B17A820CE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_24B5096DF91550C48C950F2EBA29EE01" xlink:to="loc_us-gaap_RangeMember_AA04512247D456F386816C9B17A820CE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_ED86D99D2FD65328A02F32D6087A290B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_AA04512247D456F386816C9B17A820CE" xlink:to="loc_us-gaap_MinimumMember_ED86D99D2FD65328A02F32D6087A290B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_5730C2CA70CF54DEAF372F63600EB8FE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_AA04512247D456F386816C9B17A820CE" xlink:to="loc_us-gaap_MaximumMember_5730C2CA70CF54DEAF372F63600EB8FE" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_SecuritiesDiscountRateOverLondonInterbankOfferedRate" xlink:label="loc_abm_SecuritiesDiscountRateOverLondonInterbankOfferedRate_B7CF2D8D412C55D9B03D7C256432D2CF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_75F0EDCFA8835D1781F009A9092D606A" xlink:to="loc_abm_SecuritiesDiscountRateOverLondonInterbankOfferedRate_B7CF2D8D412C55D9B03D7C256432D2CF" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_SecuritiesYieldsOverLondonInterbankOfferedRate" xlink:label="loc_abm_SecuritiesYieldsOverLondonInterbankOfferedRate_81CDF6C5D2325D408303B302E748457A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_75F0EDCFA8835D1781F009A9092D606A" xlink:to="loc_abm_SecuritiesYieldsOverLondonInterbankOfferedRate_81CDF6C5D2325D408303B302E748457A" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_SecuritiesYields" xlink:label="loc_abm_SecuritiesYields_CC50C9DBE4805458888B89EF8E94CF2F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_75F0EDCFA8835D1781F009A9092D606A" xlink:to="loc_abm_SecuritiesYields_CC50C9DBE4805458888B89EF8E94CF2F" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_AverageExpectedLifeAuctionRateSecurities" xlink:label="loc_abm_AverageExpectedLifeAuctionRateSecurities_9A421AE89A8050D8B4D63E2D0621B8F0" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems_75F0EDCFA8835D1781F009A9092D606A" xlink:to="loc_abm_AverageExpectedLifeAuctionRateSecurities_9A421AE89A8050D8B4D63E2D0621B8F0" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/AuctionRateSecuritiesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/BasisOfPresentationAndSignificantAccountingPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/BasisOfPresentationAndSignificantAccountingPoliciesGovernmentServicesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_84B64ED8AE8A545F8A8CF3F2A7FAE996" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_614E756DE5F03D4ED391F3F2A7FAC3AD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_84B64ED8AE8A545F8A8CF3F2A7FAE996" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_614E756DE5F03D4ED391F3F2A7FAC3AD" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupClassificationAxis" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_1DD1594E2478C94FC41CF3F2A7FAD76F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_614E756DE5F03D4ED391F3F2A7FAC3AD" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_1DD1594E2478C94FC41CF3F2A7FAD76F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_9C5BED2B293A65A931C3F3F2A7FAA0F5_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_1DD1594E2478C94FC41CF3F2A7FAD76F" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_9C5BED2B293A65A931C3F3F2A7FAA0F5_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupClassificationDomain" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_9C5BED2B293A65A931C3F3F2A7FAA0F5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_1DD1594E2478C94FC41CF3F2A7FAD76F" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_9C5BED2B293A65A931C3F3F2A7FAA0F5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember" xlink:label="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_C9949975C485331C3FF0F427233A7D7B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_9C5BED2B293A65A931C3F3F2A7FAA0F5" xlink:to="loc_us-gaap_DisposalGroupDisposedOfBySaleNotDiscontinuedOperationsMember_C9949975C485331C3FF0F427233A7D7B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_8899C9CCD43DA8269F41F3F2A7FA8B9A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_614E756DE5F03D4ED391F3F2A7FAC3AD" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_8899C9CCD43DA8269F41F3F2A7FA8B9A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_1D023B62EBEB0598B65FF3F2A7FACC2A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_8899C9CCD43DA8269F41F3F2A7FA8B9A" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_1D023B62EBEB0598B65FF3F2A7FACC2A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_1D023B62EBEB0598B65FF3F2A7FACC2A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_8899C9CCD43DA8269F41F3F2A7FA8B9A" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_1D023B62EBEB0598B65FF3F2A7FACC2A" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_GovernmentServicesMember" xlink:label="loc_abm_GovernmentServicesMember_E55341D269AC8E73A39FF3F2A7FA06A6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_1D023B62EBEB0598B65FF3F2A7FACC2A" xlink:to="loc_abm_GovernmentServicesMember_E55341D269AC8E73A39FF3F2A7FA06A6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinesses" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_9DAA44E567D6413EB9CDF3F2A7FA8D57" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_84B64ED8AE8A545F8A8CF3F2A7FAE996" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinesses_9DAA44E567D6413EB9CDF3F2A7FA8D57" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_BD833918ECBFD36CCCBBF3F2A7FA943F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_84B64ED8AE8A545F8A8CF3F2A7FAE996" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_BD833918ECBFD36CCCBBF3F2A7FA943F" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/BasisOfPresentationAndSignificantAccountingPoliciesManagementReimbursementRevenueDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_41A64A24CB3EC518B4B8F536BE93B67E" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_CC9B67E09B1772B3AAFBF536BE8D9D45" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_41A64A24CB3EC518B4B8F536BE93B67E" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_CC9B67E09B1772B3AAFBF536BE8D9D45" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_FE2886517B486C682510F536BE925A21" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_CC9B67E09B1772B3AAFBF536BE8D9D45" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_FE2886517B486C682510F536BE925A21" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_6BE7175AA3D57E18FFC4F536BE92BF17_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_FE2886517B486C682510F536BE925A21" xlink:to="loc_us-gaap_SegmentDomain_6BE7175AA3D57E18FFC4F536BE92BF17_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_6BE7175AA3D57E18FFC4F536BE92BF17" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_FE2886517B486C682510F536BE925A21" xlink:to="loc_us-gaap_SegmentDomain_6BE7175AA3D57E18FFC4F536BE92BF17" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_BusinessandIndustryMember" xlink:label="loc_abm_BusinessandIndustryMember_75E37E2EEAA6146A2A41F536BE93DBB9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_6BE7175AA3D57E18FFC4F536BE92BF17" xlink:to="loc_abm_BusinessandIndustryMember_75E37E2EEAA6146A2A41F536BE93DBB9" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_AviationMember" xlink:label="loc_abm_AviationMember_7224D413BDA73F6F040FF536BE93FA15" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_6BE7175AA3D57E18FFC4F536BE92BF17" xlink:to="loc_abm_AviationMember_7224D413BDA73F6F040FF536BE93FA15" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_HealthcareMember" xlink:label="loc_abm_HealthcareMember_BD1B0DA7BD782C4383D3F536BE9321F9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_6BE7175AA3D57E18FFC4F536BE92BF17" xlink:to="loc_abm_HealthcareMember_BD1B0DA7BD782C4383D3F536BE9321F9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ReimbursementRevenue" xlink:label="loc_us-gaap_ReimbursementRevenue_2F3D2A5D6E5B8C1A9A75F536BE9333C9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_41A64A24CB3EC518B4B8F536BE93B67E" xlink:to="loc_us-gaap_ReimbursementRevenue_2F3D2A5D6E5B8C1A9A75F536BE9333C9" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/BasisOfPresentationAndSignificantAccountingPoliciesPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/BasisOfPresentationAndSignificantAccountingPoliciesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/CommitmentsAndContingenciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingenciesLineItems" xlink:label="loc_us-gaap_LossContingenciesLineItems_F32CF152823F9DA2E577FF43F4E62E2E" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingenciesTable" xlink:label="loc_us-gaap_LossContingenciesTable_6D28D86737BFE0140407FF43F4E58785" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_F32CF152823F9DA2E577FF43F4E62E2E" xlink:to="loc_us-gaap_LossContingenciesTable_6D28D86737BFE0140407FF43F4E58785" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_24A5770F3BC37796E3BEFF43F4E5BC51" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_6D28D86737BFE0140407FF43F4E58785" xlink:to="loc_us-gaap_RangeAxis_24A5770F3BC37796E3BEFF43F4E5BC51" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_7271C744CEA0E4877AD2FF43F4E5F4C6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_24A5770F3BC37796E3BEFF43F4E5BC51" xlink:to="loc_us-gaap_RangeMember_7271C744CEA0E4877AD2FF43F4E5F4C6_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_7271C744CEA0E4877AD2FF43F4E5F4C6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_24A5770F3BC37796E3BEFF43F4E5BC51" xlink:to="loc_us-gaap_RangeMember_7271C744CEA0E4877AD2FF43F4E5F4C6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_DCC5F59EB6878BF5A70AFF43F4E57EE6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_7271C744CEA0E4877AD2FF43F4E5F4C6" xlink:to="loc_us-gaap_MinimumMember_DCC5F59EB6878BF5A70AFF43F4E57EE6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_9056A454B92918BB8322FF43F4E659F4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_7271C744CEA0E4877AD2FF43F4E5F4C6" xlink:to="loc_us-gaap_MaximumMember_9056A454B92918BB8322FF43F4E659F4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LitigationCaseAxis" xlink:label="loc_us-gaap_LitigationCaseAxis_66838CCCB598373B3081FF43F4E612EF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_6D28D86737BFE0140407FF43F4E58785" xlink:to="loc_us-gaap_LitigationCaseAxis_66838CCCB598373B3081FF43F4E612EF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LitigationCaseTypeDomain" xlink:label="loc_us-gaap_LitigationCaseTypeDomain_285EB2C61E04E4239133FF43F4E69D8A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LitigationCaseAxis_66838CCCB598373B3081FF43F4E612EF" xlink:to="loc_us-gaap_LitigationCaseTypeDomain_285EB2C61E04E4239133FF43F4E69D8A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LitigationCaseTypeDomain" xlink:label="loc_us-gaap_LitigationCaseTypeDomain_285EB2C61E04E4239133FF43F4E69D8A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LitigationCaseAxis_66838CCCB598373B3081FF43F4E612EF" xlink:to="loc_us-gaap_LitigationCaseTypeDomain_285EB2C61E04E4239133FF43F4E69D8A" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_HusseinAndIsseMember" xlink:label="loc_abm_HusseinAndIsseMember_D77E6A1308E536A5A65AFF43F4E6B79C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationCaseTypeDomain_285EB2C61E04E4239133FF43F4E69D8A" xlink:to="loc_abm_HusseinAndIsseMember_D77E6A1308E536A5A65AFF43F4E6B79C" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_IsseMember" xlink:label="loc_abm_IsseMember_83A24D26EAA29A3B0CC5FF43F4E6389B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LitigationCaseTypeDomain_285EB2C61E04E4239133FF43F4E69D8A" xlink:to="loc_abm_IsseMember_83A24D26EAA29A3B0CC5FF43F4E6389B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GuaranteeObligationsByNatureAxis" xlink:label="loc_us-gaap_GuaranteeObligationsByNatureAxis_4C8D35B055D5DEFEF140FF43F4E60FB2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_6D28D86737BFE0140407FF43F4E58785" xlink:to="loc_us-gaap_GuaranteeObligationsByNatureAxis_4C8D35B055D5DEFEF140FF43F4E60FB2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GuaranteeObligationsNatureDomain" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_674702841A18BAE368CAFF43F4E6D55F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_4C8D35B055D5DEFEF140FF43F4E60FB2" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_674702841A18BAE368CAFF43F4E6D55F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GuaranteeObligationsNatureDomain" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_674702841A18BAE368CAFF43F4E6D55F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_4C8D35B055D5DEFEF140FF43F4E60FB2" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_674702841A18BAE368CAFF43F4E6D55F" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_EnergySavingsContractsMember" xlink:label="loc_abm_EnergySavingsContractsMember_3CA2BF17019FAC07A278FF43F4E60351" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_674702841A18BAE368CAFF43F4E6D55F" xlink:to="loc_abm_EnergySavingsContractsMember_3CA2BF17019FAC07A278FF43F4E60351" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PerformanceGuaranteeMember" xlink:label="loc_us-gaap_PerformanceGuaranteeMember_8FFA4A41181A5C979A37FF43F4E60F6E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_674702841A18BAE368CAFF43F4E6D55F" xlink:to="loc_us-gaap_PerformanceGuaranteeMember_8FFA4A41181A5C979A37FF43F4E60F6E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_696DFFBAB85A4D0D0F85FF43F4E6B906" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_6D28D86737BFE0140407FF43F4E58785" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_696DFFBAB85A4D0D0F85FF43F4E6B906" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_4E5DE60EAF963BF37931FF43F4E6E820_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_696DFFBAB85A4D0D0F85FF43F4E6B906" xlink:to="loc_us-gaap_RelatedPartyDomain_4E5DE60EAF963BF37931FF43F4E6E820_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_4E5DE60EAF963BF37931FF43F4E6E820" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_696DFFBAB85A4D0D0F85FF43F4E6B906" xlink:to="loc_us-gaap_RelatedPartyDomain_4E5DE60EAF963BF37931FF43F4E6E820" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CorporateJointVentureMember" xlink:label="loc_us-gaap_CorporateJointVentureMember_7250CF6F21831B741A07FF43F4E67212" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_4E5DE60EAF963BF37931FF43F4E6E820" xlink:to="loc_us-gaap_CorporateJointVentureMember_7250CF6F21831B741A07FF43F4E67212" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_2B716D0BB7BEDBBC1A74FF43F4E74A1B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_F32CF152823F9DA2E577FF43F4E62E2E" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_2B716D0BB7BEDBBC1A74FF43F4E74A1B" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_SuretyBonds" xlink:label="loc_abm_SuretyBonds_7A4C50DCCC272CC97BADFF43F4E7A44F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_F32CF152823F9DA2E577FF43F4E62E2E" xlink:to="loc_abm_SuretyBonds_7A4C50DCCC272CC97BADFF43F4E7A44F" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_GuaranteeObligation" xlink:label="loc_abm_GuaranteeObligation_11DF81EE96FF444E2419FF43F4E74D5A" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_F32CF152823F9DA2E577FF43F4E62E2E" xlink:to="loc_abm_GuaranteeObligation_11DF81EE96FF444E2419FF43F4E74D5A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_1214F34B54B3F64A28C8FF43F4E7B370" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_F32CF152823F9DA2E577FF43F4E62E2E" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_1214F34B54B3F64A28C8FF43F4E7B370" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_GuaranteeObligationsMaximumExposure" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_40A6394E07AF50735F2AFF43F4E706F7" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_F32CF152823F9DA2E577FF43F4E62E2E" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_40A6394E07AF50735F2AFF43F4E706F7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingencyAccrualAtCarryingValue" xlink:label="loc_us-gaap_LossContingencyAccrualAtCarryingValue_915650E0DFF0D87EF143FF43F4E75F60" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_F32CF152823F9DA2E577FF43F4E62E2E" xlink:to="loc_us-gaap_LossContingencyAccrualAtCarryingValue_915650E0DFF0D87EF143FF43F4E75F60" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingencyEstimateOfPossibleLoss" xlink:label="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_B508698F17D50C3339B0FF43F4E7F2F5" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_F32CF152823F9DA2E577FF43F4E62E2E" xlink:to="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_B508698F17D50C3339B0FF43F4E7F2F5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LossContingencyNumberOfPlaintiffs" xlink:label="loc_us-gaap_LossContingencyNumberOfPlaintiffs_ED3A948407B51AF11EB0FF43F4E779A1" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_F32CF152823F9DA2E577FF43F4E62E2E" xlink:to="loc_us-gaap_LossContingencyNumberOfPlaintiffs_ED3A948407B51AF11EB0FF43F4E779A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LitigationSettlementAmountAwardedToOtherParty" xlink:label="loc_us-gaap_LitigationSettlementAmountAwardedToOtherParty_460C79457C6BD9083700FF43F4E746B8" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_F32CF152823F9DA2E577FF43F4E62E2E" xlink:to="loc_us-gaap_LitigationSettlementAmountAwardedToOtherParty_460C79457C6BD9083700FF43F4E746B8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsForLegalSettlements" xlink:label="loc_us-gaap_PaymentsForLegalSettlements_C6EDE6B52B39FE3FC1A8FF43F4E75F42" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_F32CF152823F9DA2E577FF43F4E62E2E" xlink:to="loc_us-gaap_PaymentsForLegalSettlements_C6EDE6B52B39FE3FC1A8FF43F4E75F42" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/CompanyAndNatureOfOperations" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/CompanyAndNatureOfOperationsNarrativeDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/ConsolidatedBalanceSheetsUnaudited" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/ConsolidatedBalanceSheetsUnauditedParenthetical" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/ConsolidatedStatementsOfCashFlowsUnaudited" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/ConsolidatedStatementsOfComprehensiveIncomeLossUnaudited" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/ConsolidatedStatementsOfComprehensiveIncomeLossUnauditedParenthetical" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/CreditFacility" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/CreditFacilityCreditFacilityInformationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/CreditFacilityInterestRateSwapsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_078B786B9BFAB89153ABF828699C31EF" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityTable" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_55D179DA468108739E7CF82869962AB2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_078B786B9BFAB89153ABF828699C31EF" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_55D179DA468108739E7CF82869962AB2" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_91A57DC27670E35C5ADBF8286997804C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_55D179DA468108739E7CF82869962AB2" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_91A57DC27670E35C5ADBF8286997804C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_50320FBB8B8D6CF79582F828699773CC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_91A57DC27670E35C5ADBF8286997804C" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_50320FBB8B8D6CF79582F828699773CC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeContractTypeDomain" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_50320FBB8B8D6CF79582F828699773CC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_91A57DC27670E35C5ADBF8286997804C" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_50320FBB8B8D6CF79582F828699773CC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestRateSwapMember" xlink:label="loc_us-gaap_InterestRateSwapMember_FA78FB11483E4FDC8047F8286997974A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_50320FBB8B8D6CF79582F828699773CC" xlink:to="loc_us-gaap_InterestRateSwapMember_FA78FB11483E4FDC8047F8286997974A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_F5EA382BDBE2EE1217BFF828699716B4" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_55D179DA468108739E7CF82869962AB2" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_F5EA382BDBE2EE1217BFF828699716B4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_D54ED2EB030D4A6EDC5CF8286997E864_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_F5EA382BDBE2EE1217BFF828699716B4" xlink:to="loc_us-gaap_EquityComponentDomain_D54ED2EB030D4A6EDC5CF8286997E864_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_D54ED2EB030D4A6EDC5CF8286997E864" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_F5EA382BDBE2EE1217BFF828699716B4" xlink:to="loc_us-gaap_EquityComponentDomain_D54ED2EB030D4A6EDC5CF8286997E864" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccumulatedNetGainLossFromCashFlowHedgesIncludingPortionAttributableToNoncontrollingInterestMember" xlink:label="loc_us-gaap_AccumulatedNetGainLossFromCashFlowHedgesIncludingPortionAttributableToNoncontrollingInterestMember_C0A9CAA4B961487D0A3BF8286997A6D9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_D54ED2EB030D4A6EDC5CF8286997E864" xlink:to="loc_us-gaap_AccumulatedNetGainLossFromCashFlowHedgesIncludingPortionAttributableToNoncontrollingInterestMember_C0A9CAA4B961487D0A3BF8286997A6D9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.sec.gov/invest/2013/invest-2013-01-31.xsd#invest_DerivativeNotionalAmount" xlink:label="loc_invest_DerivativeNotionalAmount_4591E5EE6856DD24ACC2F828699DE4E4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_078B786B9BFAB89153ABF828699C31EF" xlink:to="loc_invest_DerivativeNotionalAmount_4591E5EE6856DD24ACC2F828699DE4E4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DerivativeFixedInterestRate" xlink:label="loc_us-gaap_DerivativeFixedInterestRate_56C2351D81ED18E877FDF828699DE66B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_078B786B9BFAB89153ABF828699C31EF" xlink:to="loc_us-gaap_DerivativeFixedInterestRate_56C2351D81ED18E877FDF828699DE66B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax_37171F1AD6C50B4DEF92F828699DF9FC" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_078B786B9BFAB89153ABF828699C31EF" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax_37171F1AD6C50B4DEF92F828699DF9FC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AociTaxAttributableToParent" xlink:label="loc_us-gaap_AociTaxAttributableToParent_A27A48915C29E031184BF828699DE81C" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_078B786B9BFAB89153ABF828699C31EF" xlink:to="loc_us-gaap_AociTaxAttributableToParent_A27A48915C29E031184BF828699DE81C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet" xlink:label="loc_us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet_7516A2D2B581E0EE7991F828699D488B" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_078B786B9BFAB89153ABF828699C31EF" xlink:to="loc_us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet_7516A2D2B581E0EE7991F828699D488B" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/CreditFacilityNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_42FF2E6D563767E73CECFF43F501A9A1" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityTable" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_4F722611740236D6AFBCFF43F4FFC472" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_42FF2E6D563767E73CECFF43F501A9A1" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_4F722611740236D6AFBCFF43F4FFC472" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_147FA7EFEAC207EE7E48FF43F500C632" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_4F722611740236D6AFBCFF43F4FFC472" xlink:to="loc_us-gaap_DebtInstrumentAxis_147FA7EFEAC207EE7E48FF43F500C632" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_D7CFC0D59BF53062FF5CFF43F5007771_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_147FA7EFEAC207EE7E48FF43F500C632" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_D7CFC0D59BF53062FF5CFF43F5007771_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_D7CFC0D59BF53062FF5CFF43F5007771" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_147FA7EFEAC207EE7E48FF43F500C632" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_D7CFC0D59BF53062FF5CFF43F5007771" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_PriorCreditFacilityMember" xlink:label="loc_abm_PriorCreditFacilityMember_4B801D3285386112F36BFF43F50015B4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_D7CFC0D59BF53062FF5CFF43F5007771" xlink:to="loc_abm_PriorCreditFacilityMember_4B801D3285386112F36BFF43F50015B4" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_CreditFacilityMember" xlink:label="loc_abm_CreditFacilityMember_8F76E1335AB2E595BD90FF43F5018DF7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_D7CFC0D59BF53062FF5CFF43F5007771" xlink:to="loc_abm_CreditFacilityMember_8F76E1335AB2E595BD90FF43F5018DF7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableRateAxis" xlink:label="loc_us-gaap_VariableRateAxis_A408E67850843AEECDA0FF43F4FFE176" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_4F722611740236D6AFBCFF43F4FFC472" xlink:to="loc_us-gaap_VariableRateAxis_A408E67850843AEECDA0FF43F4FFE176" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_0C70C9AF3B4B79AB6275FF43F4FFA57C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_A408E67850843AEECDA0FF43F4FFE176" xlink:to="loc_us-gaap_VariableRateDomain_0C70C9AF3B4B79AB6275FF43F4FFA57C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_VariableRateDomain" xlink:label="loc_us-gaap_VariableRateDomain_0C70C9AF3B4B79AB6275FF43F4FFA57C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_A408E67850843AEECDA0FF43F4FFE176" xlink:to="loc_us-gaap_VariableRateDomain_0C70C9AF3B4B79AB6275FF43F4FFA57C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EurodollarMember" xlink:label="loc_us-gaap_EurodollarMember_07B345F6973FF7D7F673FF43F4FF6A1A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_0C70C9AF3B4B79AB6275FF43F4FFA57C" xlink:to="loc_us-gaap_EurodollarMember_07B345F6973FF7D7F673FF43F4FF6A1A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BaseRateMember" xlink:label="loc_us-gaap_BaseRateMember_765D6292697352427CDFFF43F4FF8F7A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_0C70C9AF3B4B79AB6275FF43F4FFA57C" xlink:to="loc_us-gaap_BaseRateMember_765D6292697352427CDFFF43F4FF8F7A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_F4BDC5C77BDDBEF36BC5FF43F5017573" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_4F722611740236D6AFBCFF43F4FFC472" xlink:to="loc_us-gaap_RangeAxis_F4BDC5C77BDDBEF36BC5FF43F5017573" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_FD9648934B82B3D66542FF43F501EB7E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_F4BDC5C77BDDBEF36BC5FF43F5017573" xlink:to="loc_us-gaap_RangeMember_FD9648934B82B3D66542FF43F501EB7E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_FD9648934B82B3D66542FF43F501EB7E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_F4BDC5C77BDDBEF36BC5FF43F5017573" xlink:to="loc_us-gaap_RangeMember_FD9648934B82B3D66542FF43F501EB7E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_CD94D07641EDC01FF586FF43F501C602" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_FD9648934B82B3D66542FF43F501EB7E" xlink:to="loc_us-gaap_MinimumMember_CD94D07641EDC01FF586FF43F501C602" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_17BDB22997E600A5EE6CFF43F50151B3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_FD9648934B82B3D66542FF43F501EB7E" xlink:to="loc_us-gaap_MaximumMember_17BDB22997E600A5EE6CFF43F50151B3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CreditFacilityAxis" xlink:label="loc_us-gaap_CreditFacilityAxis_4ADE8C6C14F2315AD50FFF43F4FFF4AF" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_4F722611740236D6AFBCFF43F4FFC472" xlink:to="loc_us-gaap_CreditFacilityAxis_4ADE8C6C14F2315AD50FFF43F4FFF4AF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_E809611935CAAF0B2E66FF43F4FF53BD_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_4ADE8C6C14F2315AD50FFF43F4FFF4AF" xlink:to="loc_us-gaap_CreditFacilityDomain_E809611935CAAF0B2E66FF43F4FF53BD_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CreditFacilityDomain" xlink:label="loc_us-gaap_CreditFacilityDomain_E809611935CAAF0B2E66FF43F4FF53BD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_4ADE8C6C14F2315AD50FFF43F4FFF4AF" xlink:to="loc_us-gaap_CreditFacilityDomain_E809611935CAAF0B2E66FF43F4FF53BD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RevolvingCreditFacilityMember" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_F8A84770FD6B58AF003EFF43F500EBEB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_E809611935CAAF0B2E66FF43F4FF53BD" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_F8A84770FD6B58AF003EFF43F500EBEB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StandbyLettersOfCreditMember" xlink:label="loc_us-gaap_StandbyLettersOfCreditMember_84AAFB162CEE830D06D8FF43F500A248" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_E809611935CAAF0B2E66FF43F4FF53BD" xlink:to="loc_us-gaap_StandbyLettersOfCreditMember_84AAFB162CEE830D06D8FF43F500A248" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_SwingLineLoanMember" xlink:label="loc_abm_SwingLineLoanMember_06CAC4EF0017545B8991FF43F500C75F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_E809611935CAAF0B2E66FF43F4FF53BD" xlink:to="loc_abm_SwingLineLoanMember_06CAC4EF0017545B8991FF43F500C75F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_6DA7FF7134E4F870A142FF43F500958A" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_4F722611740236D6AFBCFF43F4FFC472" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_6DA7FF7134E4F870A142FF43F500958A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_409E12078E15BB14761CFF43F5000E4C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_6DA7FF7134E4F870A142FF43F500958A" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_409E12078E15BB14761CFF43F5000E4C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_409E12078E15BB14761CFF43F5000E4C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_6DA7FF7134E4F870A142FF43F500958A" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_409E12078E15BB14761CFF43F5000E4C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditMember" xlink:label="loc_us-gaap_LineOfCreditMember_1A876BE931BE1C994FEDFF43F500C21A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_409E12078E15BB14761CFF43F5000E4C" xlink:to="loc_us-gaap_LineOfCreditMember_1A876BE931BE1C994FEDFF43F500C21A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LoansPayableMember" xlink:label="loc_us-gaap_LoansPayableMember_4FCA96A326A688A78F6FFF43F500B4DE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_409E12078E15BB14761CFF43F5000E4C" xlink:to="loc_us-gaap_LoansPayableMember_4FCA96A326A688A78F6FFF43F500B4DE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_4CDDC631648D7BABE977FF43F4FF2B59" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_4F722611740236D6AFBCFF43F4FFC472" xlink:to="loc_us-gaap_StatementScenarioAxis_4CDDC631648D7BABE977FF43F4FF2B59" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_363E1F2E6902DAF98B0CFF43F4FFDBA7_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_4CDDC631648D7BABE977FF43F4FF2B59" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_363E1F2E6902DAF98B0CFF43F4FFDBA7_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_363E1F2E6902DAF98B0CFF43F4FFDBA7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_4CDDC631648D7BABE977FF43F4FF2B59" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_363E1F2E6902DAF98B0CFF43F4FFDBA7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScenarioForecastMember" xlink:label="loc_us-gaap_ScenarioForecastMember_C981B04DF7C1EE831647FF43F4FF5FF7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScenarioUnspecifiedDomain_363E1F2E6902DAF98B0CFF43F4FFDBA7" xlink:to="loc_us-gaap_ScenarioForecastMember_C981B04DF7C1EE831647FF43F4FF5FF7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_89875C0EC2DA4C770171FF43F501585A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_42FF2E6D563767E73CECFF43F501A9A1" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_89875C0EC2DA4C770171FF43F501585A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentTerm" xlink:label="loc_us-gaap_DebtInstrumentTerm_997BF3E72CCE4F12EBD1FF43F501BC84" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_42FF2E6D563767E73CECFF43F501A9A1" xlink:to="loc_us-gaap_DebtInstrumentTerm_997BF3E72CCE4F12EBD1FF43F501BC84" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentFaceAmount" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_A3C4C5BB3532073126D7FF43F5012A3C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_42FF2E6D563767E73CECFF43F501A9A1" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_A3C4C5BB3532073126D7FF43F5012A3C" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_LineOfCreditFacilityMaximumBorrowingCapacityAfterInitialYearOfTerm" xlink:label="loc_abm_LineOfCreditFacilityMaximumBorrowingCapacityAfterInitialYearOfTerm_701A31F99201A74C06BDFF43F501EF44" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_42FF2E6D563767E73CECFF43F501A9A1" xlink:to="loc_abm_LineOfCreditFacilityMaximumBorrowingCapacityAfterInitialYearOfTerm_701A31F99201A74C06BDFF43F501EF44" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_99D279C9846E0C3A324CFF43F501471A" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_42FF2E6D563767E73CECFF43F501A9A1" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_99D279C9846E0C3A324CFF43F501471A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtWeightedAverageInterestRate" xlink:label="loc_us-gaap_DebtWeightedAverageInterestRate_09EA54C2B778AC939FCEFF43F501573B" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_42FF2E6D563767E73CECFF43F501A9A1" xlink:to="loc_us-gaap_DebtWeightedAverageInterestRate_09EA54C2B778AC939FCEFF43F501573B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage" xlink:label="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_6D66E657F087134A7105FF43F501137C" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_42FF2E6D563767E73CECFF43F501A9A1" xlink:to="loc_us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage_6D66E657F087134A7105FF43F501137C" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_DebtInstrumentCovenantTotalLeverageRatio" xlink:label="loc_abm_DebtInstrumentCovenantTotalLeverageRatio_595BDB67BC6CA5D11132FF43F5010DF5" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_42FF2E6D563767E73CECFF43F501A9A1" xlink:to="loc_abm_DebtInstrumentCovenantTotalLeverageRatio_595BDB67BC6CA5D11132FF43F5010DF5" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_DebtInstrumentCovenantFixedChargeCoverageRatio" xlink:label="loc_abm_DebtInstrumentCovenantFixedChargeCoverageRatio_0EFACE6933934EF2D47AFF43F5029DA5" xlink:type="locator" />
    <link:definitionArc order="9" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_42FF2E6D563767E73CECFF43F501A9A1" xlink:to="loc_abm_DebtInstrumentCovenantFixedChargeCoverageRatio_0EFACE6933934EF2D47AFF43F5029DA5" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_DebtInstrumentCovenantTotalLeverageRatioOptionalRatioForFourFiscalQuartersInEventOfMaterialAcquisition" xlink:label="loc_abm_DebtInstrumentCovenantTotalLeverageRatioOptionalRatioForFourFiscalQuartersInEventOfMaterialAcquisition_9DC10F29248006608FADFF43F50274CC" xlink:type="locator" />
    <link:definitionArc order="10" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_42FF2E6D563767E73CECFF43F501A9A1" xlink:to="loc_abm_DebtInstrumentCovenantTotalLeverageRatioOptionalRatioForFourFiscalQuartersInEventOfMaterialAcquisition_9DC10F29248006608FADFF43F50274CC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredFinanceCostsGross" xlink:label="loc_us-gaap_DeferredFinanceCostsGross_38208C8DEC4A05508B09FF43F5029523" xlink:type="locator" />
    <link:definitionArc order="11" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_42FF2E6D563767E73CECFF43F501A9A1" xlink:to="loc_us-gaap_DeferredFinanceCostsGross_38208C8DEC4A05508B09FF43F5029523" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/CreditFacilityTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/CreditFacilityTermLoanMaturitiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentLineItems" xlink:label="loc_us-gaap_DebtInstrumentLineItems_39F8B84454B92D39609DF7EF53B11C9C" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentTable" xlink:label="loc_us-gaap_DebtInstrumentTable_1EABCBE81239275D2BEAF7EF53B030FB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_39F8B84454B92D39609DF7EF53B11C9C" xlink:to="loc_us-gaap_DebtInstrumentTable_1EABCBE81239275D2BEAF7EF53B030FB" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongtermDebtTypeAxis" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_F9F688A040FC806C915AF7EF53B0534A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_1EABCBE81239275D2BEAF7EF53B030FB" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_F9F688A040FC806C915AF7EF53B0534A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_00FE90DF1DE298A42D8AF7EF53B1AF7B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_F9F688A040FC806C915AF7EF53B0534A" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_00FE90DF1DE298A42D8AF7EF53B1AF7B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongtermDebtTypeDomain" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_00FE90DF1DE298A42D8AF7EF53B1AF7B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_F9F688A040FC806C915AF7EF53B0534A" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_00FE90DF1DE298A42D8AF7EF53B1AF7B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LoansPayableMember" xlink:label="loc_us-gaap_LoansPayableMember_30219F4642EF20CE1772F7EF53B1AD27" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_00FE90DF1DE298A42D8AF7EF53B1AF7B" xlink:to="loc_us-gaap_LoansPayableMember_30219F4642EF20CE1772F7EF53B1AD27" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MaturitiesOfLongTermDebtAbstract" xlink:label="loc_us-gaap_MaturitiesOfLongTermDebtAbstract_C7C7D70C9B2C5A3468B9F7EF53B159A7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_39F8B84454B92D39609DF7EF53B11C9C" xlink:to="loc_us-gaap_MaturitiesOfLongTermDebtAbstract_C7C7D70C9B2C5A3468B9F7EF53B159A7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_9BE942101ABC9C73AC4AF7EF53B19602" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MaturitiesOfLongTermDebtAbstract_C7C7D70C9B2C5A3468B9F7EF53B159A7" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_9BE942101ABC9C73AC4AF7EF53B19602" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_17A945666A51E2C9A1A9F7EF53B13127" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MaturitiesOfLongTermDebtAbstract_C7C7D70C9B2C5A3468B9F7EF53B159A7" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_17A945666A51E2C9A1A9F7EF53B13127" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_F5FA09C82D1647E9F7F5F7EF53B13579" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MaturitiesOfLongTermDebtAbstract_C7C7D70C9B2C5A3468B9F7EF53B159A7" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_F5FA09C82D1647E9F7F5F7EF53B13579" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_FE3280531CFF9805BF9BF7EF53B1F05D" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MaturitiesOfLongTermDebtAbstract_C7C7D70C9B2C5A3468B9F7EF53B159A7" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_FE3280531CFF9805BF9BF7EF53B1F05D" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/DocumentAndEntityInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/FairValueOfFinancialInstruments" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/FairValueOfFinancialInstrumentsFinancialAssetsAndLiabilitiesMeasuredAtFairValueOnRecurringBasisDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_51DAE6E43F25DFEED018F84EB262435F" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_A854DBE4A01CB28EBDC2F84EB26248D1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_51DAE6E43F25DFEED018F84EB262435F" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_A854DBE4A01CB28EBDC2F84EB26248D1" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_5D0CAE0CC11D54076B58F84EB262FB42" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_A854DBE4A01CB28EBDC2F84EB26248D1" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_5D0CAE0CC11D54076B58F84EB262FB42" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_2E0390C8D0F9D56B3EB8F84EB262D767_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_5D0CAE0CC11D54076B58F84EB262FB42" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_2E0390C8D0F9D56B3EB8F84EB262D767_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_2E0390C8D0F9D56B3EB8F84EB262D767" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_5D0CAE0CC11D54076B58F84EB262FB42" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_2E0390C8D0F9D56B3EB8F84EB262D767" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_94E33FCCB47478BA8602F84EB2623135" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_2E0390C8D0F9D56B3EB8F84EB262D767" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_94E33FCCB47478BA8602F84EB2623135" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_4959486C2BAA08FA7CFBF84EB2621B02" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_A854DBE4A01CB28EBDC2F84EB26248D1" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_4959486C2BAA08FA7CFBF84EB2621B02" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2517AB98A5BCCB39D11FF84EB262836A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_4959486C2BAA08FA7CFBF84EB2621B02" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2517AB98A5BCCB39D11FF84EB262836A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2517AB98A5BCCB39D11FF84EB262836A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_4959486C2BAA08FA7CFBF84EB2621B02" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2517AB98A5BCCB39D11FF84EB262836A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueInputsLevel1Member" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_702E987E79E59CCB1775F84EB262B121" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2517AB98A5BCCB39D11FF84EB262836A" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_702E987E79E59CCB1775F84EB262B121" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueInputsLevel2Member" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_8D4B6106F81B509F4DD8F84EB2628E0F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2517AB98A5BCCB39D11FF84EB262836A" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_8D4B6106F81B509F4DD8F84EB2628E0F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_E068A04988B21DF04658F84EB262ED41" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_2517AB98A5BCCB39D11FF84EB262836A" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_E068A04988B21DF04658F84EB262ED41" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_58DD5D785C3161D57359F84EB2627949" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_51DAE6E43F25DFEED018F84EB262435F" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_58DD5D785C3161D57359F84EB2627949" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestrictedCashAndCashEquivalentsNoncurrent" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsNoncurrent_C12BD340C4B1D9FBC480F84EB2628D75" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_51DAE6E43F25DFEED018F84EB262435F" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsNoncurrent_C12BD340C4B1D9FBC480F84EB2628D75" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DeferredCompensationPlanAssets" xlink:label="loc_us-gaap_DeferredCompensationPlanAssets_89A9ABC068BE52D46100F84EB2625362" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_51DAE6E43F25DFEED018F84EB262435F" xlink:to="loc_us-gaap_DeferredCompensationPlanAssets_89A9ABC068BE52D46100F84EB2625362" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DebtInstrumentFairValue" xlink:label="loc_us-gaap_DebtInstrumentFairValue_CB1B40EF155386E45747F84EB2629D04" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_51DAE6E43F25DFEED018F84EB262435F" xlink:to="loc_us-gaap_DebtInstrumentFairValue_CB1B40EF155386E45747F84EB2629D04" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestRateDerivativeAssetsAtFairValue" xlink:label="loc_us-gaap_InterestRateDerivativeAssetsAtFairValue_68DD96C99FE4DA04988DF84EB2626308" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_51DAE6E43F25DFEED018F84EB262435F" xlink:to="loc_us-gaap_InterestRateDerivativeAssetsAtFairValue_68DD96C99FE4DA04988DF84EB2626308" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AvailableForSaleSecurities" xlink:label="loc_us-gaap_AvailableForSaleSecurities_82F616022F09FA08D2DCF84EB26CF34F" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_51DAE6E43F25DFEED018F84EB262435F" xlink:to="loc_us-gaap_AvailableForSaleSecurities_82F616022F09FA08D2DCF84EB26CF34F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_C7BD3C0730DBC5A0953FF84EB26C07CF" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_51DAE6E43F25DFEED018F84EB262435F" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_C7BD3C0730DBC5A0953FF84EB26C07CF" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/FairValueOfFinancialInstrumentsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/IncomeTaxes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLossCarryforwardsLineItems" xlink:label="loc_us-gaap_OperatingLossCarryforwardsLineItems_8A24C205D0BC33DFFD67F536BC43BEB8" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingLossCarryforwardsTable" xlink:label="loc_us-gaap_OperatingLossCarryforwardsTable_86195B749D2F41590D0CF536BC3DE68A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_8A24C205D0BC33DFFD67F536BC43BEB8" xlink:to="loc_us-gaap_OperatingLossCarryforwardsTable_86195B749D2F41590D0CF536BC3DE68A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementScenarioAxis" xlink:label="loc_us-gaap_StatementScenarioAxis_D45913F34A4A1421A3B4F536BC3DA1C2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_86195B749D2F41590D0CF536BC3DE68A" xlink:to="loc_us-gaap_StatementScenarioAxis_D45913F34A4A1421A3B4F536BC3DA1C2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_8BD9731C042DA0324A68F536BC3D3229_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementScenarioAxis_D45913F34A4A1421A3B4F536BC3DA1C2" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_8BD9731C042DA0324A68F536BC3D3229_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScenarioUnspecifiedDomain" xlink:label="loc_us-gaap_ScenarioUnspecifiedDomain_8BD9731C042DA0324A68F536BC3D3229" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementScenarioAxis_D45913F34A4A1421A3B4F536BC3DA1C2" xlink:to="loc_us-gaap_ScenarioUnspecifiedDomain_8BD9731C042DA0324A68F536BC3D3229" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScenarioForecastMember" xlink:label="loc_us-gaap_ScenarioForecastMember_A3F9DDE42E3E09A0BFF0F536BC3DAC45" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ScenarioUnspecifiedDomain_8BD9731C042DA0324A68F536BC3D3229" xlink:to="loc_us-gaap_ScenarioForecastMember_A3F9DDE42E3E09A0BFF0F536BC3DAC45" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_C7DEF4C7AC6CDCC32D2AF536BC437FB0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_8A24C205D0BC33DFFD67F536BC43BEB8" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_C7DEF4C7AC6CDCC32D2AF536BC437FB0" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/Insurance" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/InsuranceInstrumentsUsedToCollateralizeInsuranceObligationsDetails" xlink:type="extended">
    <link:loc xlink:href="abm-20180131.xsd#abm_LettersOfCreditLineItems" xlink:label="loc_abm_LettersOfCreditLineItems_7039E379278A289D1EC2F84EB226990B" xlink:type="locator" />
    <link:loc xlink:href="abm-20180131.xsd#abm_LettersOfCreditTable" xlink:label="loc_abm_LettersOfCreditTable_9E5ED371957BAA6C403DF84EB226F109" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_abm_LettersOfCreditLineItems_7039E379278A289D1EC2F84EB226990B" xlink:to="loc_abm_LettersOfCreditTable_9E5ED371957BAA6C403DF84EB226F109" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="abm-20180131.xsd#abm_InstrumentsUsedtoCollateralizeInsuranceObligationsbyTypeAxis" xlink:label="loc_abm_InstrumentsUsedtoCollateralizeInsuranceObligationsbyTypeAxis_685CB17E0BF5B6AA3A59F84EB2267B3E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_abm_LettersOfCreditTable_9E5ED371957BAA6C403DF84EB226F109" xlink:to="loc_abm_InstrumentsUsedtoCollateralizeInsuranceObligationsbyTypeAxis_685CB17E0BF5B6AA3A59F84EB2267B3E" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_InstrumentsUsedtoCollateralizeInsuranceObligationsTypeDomain" xlink:label="loc_abm_InstrumentsUsedtoCollateralizeInsuranceObligationsTypeDomain_5A5F6C8AEF8EBAA3D762F84EB226771C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_abm_InstrumentsUsedtoCollateralizeInsuranceObligationsbyTypeAxis_685CB17E0BF5B6AA3A59F84EB2267B3E" xlink:to="loc_abm_InstrumentsUsedtoCollateralizeInsuranceObligationsTypeDomain_5A5F6C8AEF8EBAA3D762F84EB226771C_default" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_InstrumentsUsedtoCollateralizeInsuranceObligationsTypeDomain" xlink:label="loc_abm_InstrumentsUsedtoCollateralizeInsuranceObligationsTypeDomain_5A5F6C8AEF8EBAA3D762F84EB226771C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_abm_InstrumentsUsedtoCollateralizeInsuranceObligationsbyTypeAxis_685CB17E0BF5B6AA3A59F84EB2267B3E" xlink:to="loc_abm_InstrumentsUsedtoCollateralizeInsuranceObligationsTypeDomain_5A5F6C8AEF8EBAA3D762F84EB226771C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StandbyLettersOfCreditMember" xlink:label="loc_us-gaap_StandbyLettersOfCreditMember_69EE48A97FE459D05691F84EB22608CD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_InstrumentsUsedtoCollateralizeInsuranceObligationsTypeDomain_5A5F6C8AEF8EBAA3D762F84EB226771C" xlink:to="loc_us-gaap_StandbyLettersOfCreditMember_69EE48A97FE459D05691F84EB22608CD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SuretyBondMember" xlink:label="loc_us-gaap_SuretyBondMember_F519B3B62962A7F955D9F84EB22629FF" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_InstrumentsUsedtoCollateralizeInsuranceObligationsTypeDomain_5A5F6C8AEF8EBAA3D762F84EB226771C" xlink:to="loc_us-gaap_SuretyBondMember_F519B3B62962A7F955D9F84EB22629FF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_DepositsMember" xlink:label="loc_us-gaap_DepositsMember_3B94737A14A3E9CF05A4F84EB2261B91" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_InstrumentsUsedtoCollateralizeInsuranceObligationsTypeDomain_5A5F6C8AEF8EBAA3D762F84EB226771C" xlink:to="loc_us-gaap_DepositsMember_3B94737A14A3E9CF05A4F84EB2261B91" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_InstrumentsUsedToCollateralizeInsuranceObligations" xlink:label="loc_abm_InstrumentsUsedToCollateralizeInsuranceObligations_67C77ACD5921B0692CEEF84EB2260220" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_LettersOfCreditLineItems_7039E379278A289D1EC2F84EB226990B" xlink:to="loc_abm_InstrumentsUsedToCollateralizeInsuranceObligations_67C77ACD5921B0692CEEF84EB2260220" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/InsuranceInsuranceRelatedBalancesAndActivityDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpenseLineItems" xlink:label="loc_us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpenseLineItems_129711BFEDFA58D9BA3722135B3B8088" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpenseTable" xlink:label="loc_us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpenseTable_E4978447D9395026AB91F8C32AA968CF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpenseLineItems_129711BFEDFA58D9BA3722135B3B8088" xlink:to="loc_us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpenseTable_E4978447D9395026AB91F8C32AA968CF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="abm-20180131.xsd#abm_InsurancePoliciesAxis" xlink:label="loc_abm_InsurancePoliciesAxis_BC4DBD6844A25942B6E50D87A326EEF1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpenseTable_E4978447D9395026AB91F8C32AA968CF" xlink:to="loc_abm_InsurancePoliciesAxis_BC4DBD6844A25942B6E50D87A326EEF1" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_InsurancePoliciesDomain" xlink:label="loc_abm_InsurancePoliciesDomain_D237FBA7E5B99A8EA0CF1011D422EE74_0BDACEF9E3385801B79538849520098F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_abm_InsurancePoliciesAxis_BC4DBD6844A25942B6E50D87A326EEF1" xlink:to="loc_abm_InsurancePoliciesDomain_D237FBA7E5B99A8EA0CF1011D422EE74_0BDACEF9E3385801B79538849520098F" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_InsurancePoliciesDomain" xlink:label="loc_abm_InsurancePoliciesDomain_DA9B2C8D719C5AB68860C7006A81EC48" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_abm_InsurancePoliciesAxis_BC4DBD6844A25942B6E50D87A326EEF1" xlink:to="loc_abm_InsurancePoliciesDomain_DA9B2C8D719C5AB68860C7006A81EC48" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_AllOtherClaimTypesMember" xlink:label="loc_abm_AllOtherClaimTypesMember_BA4E3590A3F95E0F80AE065ABBA77487" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_InsurancePoliciesDomain_DA9B2C8D719C5AB68860C7006A81EC48" xlink:to="loc_abm_AllOtherClaimTypesMember_BA4E3590A3F95E0F80AE065ABBA77487" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_MedicalAndDentalSelfInsuranceProgramMember" xlink:label="loc_abm_MedicalAndDentalSelfInsuranceProgramMember_58A738D4A0715867A07CD4F8C092A1FA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_InsurancePoliciesDomain_DA9B2C8D719C5AB68860C7006A81EC48" xlink:to="loc_abm_MedicalAndDentalSelfInsuranceProgramMember_58A738D4A0715867A07CD4F8C092A1FA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SelfInsuranceReserve" xlink:label="loc_us-gaap_SelfInsuranceReserve_8123BFDB3A1B56B0A68BB9DC6E6EF6AB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpenseLineItems_129711BFEDFA58D9BA3722135B3B8088" xlink:to="loc_us-gaap_SelfInsuranceReserve_8123BFDB3A1B56B0A68BB9DC6E6EF6AB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EstimatedInsuranceRecoveries" xlink:label="loc_us-gaap_EstimatedInsuranceRecoveries_5AA6A953459259A1BC6797C44133F43C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilityForClaimsAndClaimsAdjustmentExpenseLineItems_129711BFEDFA58D9BA3722135B3B8088" xlink:to="loc_us-gaap_EstimatedInsuranceRecoveries_5AA6A953459259A1BC6797C44133F43C" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/InsuranceNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="abm-20180131.xsd#abm_ScheduleOfOtherLiabilitiesLineItems" xlink:label="loc_abm_ScheduleOfOtherLiabilitiesLineItems_C9B6CB082C46492F8F75F536BCFCA62B" xlink:type="locator" />
    <link:loc xlink:href="abm-20180131.xsd#abm_ScheduleOfOtherLiabilitiesTable" xlink:label="loc_abm_ScheduleOfOtherLiabilitiesTable_C96408FEDB489CD8251DF536BCFC69A8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_abm_ScheduleOfOtherLiabilitiesLineItems_C9B6CB082C46492F8F75F536BCFCA62B" xlink:to="loc_abm_ScheduleOfOtherLiabilitiesTable_C96408FEDB489CD8251DF536BCFC69A8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeAxis" xlink:label="loc_us-gaap_RangeAxis_45488F315C1F751EEA41F536BCFCA52B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_abm_ScheduleOfOtherLiabilitiesTable_C96408FEDB489CD8251DF536BCFC69A8" xlink:to="loc_us-gaap_RangeAxis_45488F315C1F751EEA41F536BCFCA52B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_226429106EB2D5AC20C9F536BCFC2611_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RangeAxis_45488F315C1F751EEA41F536BCFCA52B" xlink:to="loc_us-gaap_RangeMember_226429106EB2D5AC20C9F536BCFC2611_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RangeMember" xlink:label="loc_us-gaap_RangeMember_226429106EB2D5AC20C9F536BCFC2611" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RangeAxis_45488F315C1F751EEA41F536BCFCA52B" xlink:to="loc_us-gaap_RangeMember_226429106EB2D5AC20C9F536BCFC2611" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_BE90305359EBD73E2E2EF536BCFC9DAE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_226429106EB2D5AC20C9F536BCFC2611" xlink:to="loc_us-gaap_MinimumMember_BE90305359EBD73E2E2EF536BCFC9DAE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MaximumMember" xlink:label="loc_us-gaap_MaximumMember_DA786AF49DDE87B50AB5F536BCFC27F3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RangeMember_226429106EB2D5AC20C9F536BCFC2611" xlink:to="loc_us-gaap_MaximumMember_DA786AF49DDE87B50AB5F536BCFC27F3" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_SelfInsuredRetentionAmountPerOccurrence" xlink:label="loc_abm_SelfInsuredRetentionAmountPerOccurrence_E4B78F0EDD17948CB371F536BCFC52E0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_ScheduleOfOtherLiabilitiesLineItems_C9B6CB082C46492F8F75F536BCFCA62B" xlink:to="loc_abm_SelfInsuredRetentionAmountPerOccurrence_E4B78F0EDD17948CB371F536BCFC52E0" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_WorkersCompensationGeneralLiabilityandOtherInsurableRisksInsurancePolicyLimit" xlink:label="loc_abm_WorkersCompensationGeneralLiabilityandOtherInsurableRisksInsurancePolicyLimit_5D8371F8D1564A5BB110F536BCFC5292" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_ScheduleOfOtherLiabilitiesLineItems_C9B6CB082C46492F8F75F536BCFCA62B" xlink:to="loc_abm_WorkersCompensationGeneralLiabilityandOtherInsurableRisksInsurancePolicyLimit_5D8371F8D1564A5BB110F536BCFC5292" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_InsurancePolicyCoverageGeneralLiabilityAndAutomobileLiabilityLosses" xlink:label="loc_abm_InsurancePolicyCoverageGeneralLiabilityAndAutomobileLiabilityLosses_3F9D0D53292193C752EFF536BCFC4B9F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_ScheduleOfOtherLiabilitiesLineItems_C9B6CB082C46492F8F75F536BCFCA62B" xlink:to="loc_abm_InsurancePolicyCoverageGeneralLiabilityAndAutomobileLiabilityLosses_3F9D0D53292193C752EFF536BCFC4B9F" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_PropertyDamagePolicyLimit" xlink:label="loc_abm_PropertyDamagePolicyLimit_962D164DFDEA79AC420EF536BCFC56BE" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_ScheduleOfOtherLiabilitiesLineItems_C9B6CB082C46492F8F75F536BCFCA62B" xlink:to="loc_abm_PropertyDamagePolicyLimit_962D164DFDEA79AC420EF536BCFC56BE" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_SelfInsuredRetentionAmountPerParticipantPerYearForCertainEmployeeMedicalAndDentalPrograms" xlink:label="loc_abm_SelfInsuredRetentionAmountPerParticipantPerYearForCertainEmployeeMedicalAndDentalPrograms_23460F52DEB15CF8EA4EF536BCFC8DDD" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_ScheduleOfOtherLiabilitiesLineItems_C9B6CB082C46492F8F75F536BCFCA62B" xlink:to="loc_abm_SelfInsuredRetentionAmountPerParticipantPerYearForCertainEmployeeMedicalAndDentalPrograms_23460F52DEB15CF8EA4EF536BCFC8DDD" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_IncreaseinTotalReserveClaims" xlink:label="loc_abm_IncreaseinTotalReserveClaims_B938572D1B51EC65F74CF536BCFC98E4" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_ScheduleOfOtherLiabilitiesLineItems_C9B6CB082C46492F8F75F536BCFCA62B" xlink:to="loc_abm_IncreaseinTotalReserveClaims_B938572D1B51EC65F74CF536BCFC98E4" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_InsuranceReserveAdjustmentLessThanOrGreaterThanPriorYearAdjustmentAmount" xlink:label="loc_abm_InsuranceReserveAdjustmentLessThanOrGreaterThanPriorYearAdjustmentAmount_C81B10ED1D254ED50BA6F536BCFC0F14" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_ScheduleOfOtherLiabilitiesLineItems_C9B6CB082C46492F8F75F536BCFCA62B" xlink:to="loc_abm_InsuranceReserveAdjustmentLessThanOrGreaterThanPriorYearAdjustmentAmount_C81B10ED1D254ED50BA6F536BCFC0F14" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/InsuranceTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/NetIncomePerCommonShare" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/NetIncomePerCommonShareAntiDilutiveOutstandingStockAwardsIssuedUnderShareBasedCompensationPlansDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/NetIncomePerCommonShareCalculationsOfBasicAndDilutedNetIncomePerCommonShareDetails" xlink:type="extended">
    <link:loc xlink:href="abm-20180131.xsd#abm_ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassLineItems" xlink:label="loc_abm_ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassLineItems_3ABA90636531335CE8D7F3F2A7ACEA8C" xlink:type="locator" />
    <link:loc xlink:href="abm-20180131.xsd#abm_ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassTable" xlink:label="loc_abm_ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassTable_30609E3EDF697F3707C9F3F2A7ACF7A7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_abm_ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassLineItems_3ABA90636531335CE8D7F3F2A7ACEA8C" xlink:to="loc_abm_ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassTable_30609E3EDF697F3707C9F3F2A7ACF7A7" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_AwardTypeAxis" xlink:label="loc_us-gaap_AwardTypeAxis_91EC2345490F4B0DFE81F3F2A7AC0BA3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_abm_ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassTable_30609E3EDF697F3707C9F3F2A7ACF7A7" xlink:to="loc_us-gaap_AwardTypeAxis_91EC2345490F4B0DFE81F3F2A7AC0BA3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C5FE51C8373C2B8A4F68F3F2A7AC68AB_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_91EC2345490F4B0DFE81F3F2A7AC0BA3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C5FE51C8373C2B8A4F68F3F2A7AC68AB_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C5FE51C8373C2B8A4F68F3F2A7AC68AB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_91EC2345490F4B0DFE81F3F2A7AC0BA3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C5FE51C8373C2B8A4F68F3F2A7AC68AB" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_A460A487E38858A1AF97F3F2A7AC6827" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C5FE51C8373C2B8A4F68F3F2A7AC68AB" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_A460A487E38858A1AF97F3F2A7AC6827" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeStockOptionMember" xlink:label="loc_us-gaap_EmployeeStockOptionMember_F103947D30FE72D5235EF3F2A7AC3FE7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C5FE51C8373C2B8A4F68F3F2A7AC68AB" xlink:to="loc_us-gaap_EmployeeStockOptionMember_F103947D30FE72D5235EF3F2A7AC3FE7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PerformanceSharesMember" xlink:label="loc_us-gaap_PerformanceSharesMember_E8655AE6E4ECB1939F5BF3F2A7AC622E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_C5FE51C8373C2B8A4F68F3F2A7AC68AB" xlink:to="loc_us-gaap_PerformanceSharesMember_E8655AE6E4ECB1939F5BF3F2A7AC622E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperations" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperations_B876ADEE5D0E26AC22FFF3F2A7AC47D1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassLineItems_3ABA90636531335CE8D7F3F2A7ACEA8C" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperations_B876ADEE5D0E26AC22FFF3F2A7AC47D1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_D623ABB8A2622E5B6476F3F2A7AC0977" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassLineItems_3ABA90636531335CE8D7F3F2A7ACEA8C" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity_D623ABB8A2622E5B6476F3F2A7AC0977" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_NetIncomeLoss" xlink:label="loc_us-gaap_NetIncomeLoss_22B99CE2AAAA1D8D7399F3F2A7ACDBC9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassLineItems_3ABA90636531335CE8D7F3F2A7ACEA8C" xlink:to="loc_us-gaap_NetIncomeLoss_22B99CE2AAAA1D8D7399F3F2A7ACDBC9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_A2DD442E9C64F03C660FF3F2A7ACDE87" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassLineItems_3ABA90636531335CE8D7F3F2A7ACEA8C" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_A2DD442E9C64F03C660FF3F2A7ACDE87" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract" xlink:label="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract_A609B52E0DF55D1E6D8EF3F2A7AC3919" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassLineItems_3ABA90636531335CE8D7F3F2A7ACEA8C" xlink:to="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract_A609B52E0DF55D1E6D8EF3F2A7AC3919" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_F68EC3CC86CFE3190BADF3F2A7AC1248" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustmentAbstract_A609B52E0DF55D1E6D8EF3F2A7AC3919" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_F68EC3CC86CFE3190BADF3F2A7AC1248" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_296350E6A4A108B5E223F3F2A7ACD4E3" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassLineItems_3ABA90636531335CE8D7F3F2A7ACEA8C" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_296350E6A4A108B5E223F3F2A7ACD4E3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EarningsPerShareBasicAbstract" xlink:label="loc_us-gaap_EarningsPerShareBasicAbstract_5B160B660CBB34101FEFF3F2A7AC2F20" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassLineItems_3ABA90636531335CE8D7F3F2A7ACEA8C" xlink:to="loc_us-gaap_EarningsPerShareBasicAbstract_5B160B660CBB34101FEFF3F2A7AC2F20" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerBasicShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_8809E40F15088B768245F3F2A7AC1651" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_5B160B660CBB34101FEFF3F2A7AC2F20" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_8809E40F15088B768245F3F2A7AC1651" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_981A24BA931DFBB16357F3F2A7ACEB4F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_5B160B660CBB34101FEFF3F2A7AC2F20" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_981A24BA931DFBB16357F3F2A7ACEB4F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EarningsPerShareBasic" xlink:label="loc_us-gaap_EarningsPerShareBasic_4EFCE85ABDCC624D215FF3F2A7AC6420" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_5B160B660CBB34101FEFF3F2A7AC2F20" xlink:to="loc_us-gaap_EarningsPerShareBasic_4EFCE85ABDCC624D215FF3F2A7AC6420" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EarningsPerShareDilutedAbstract" xlink:label="loc_us-gaap_EarningsPerShareDilutedAbstract_9183BA012C213B597950F3F2A7AC3723" xlink:type="locator" />
    <link:definitionArc order="8" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_abm_ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassLineItems_3ABA90636531335CE8D7F3F2A7ACEA8C" xlink:to="loc_us-gaap_EarningsPerShareDilutedAbstract_9183BA012C213B597950F3F2A7AC3723" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_81D58D9AB1EC92235F94F3F2A7AC4FDA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_9183BA012C213B597950F3F2A7AC3723" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_81D58D9AB1EC92235F94F3F2A7AC4FDA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_A7D578FDE06806C6D0EDF3F2A7ACC4E8" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_9183BA012C213B597950F3F2A7AC3723" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_A7D578FDE06806C6D0EDF3F2A7ACC4E8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EarningsPerShareDiluted" xlink:label="loc_us-gaap_EarningsPerShareDiluted_954C7DD88EF46DB1D0E2F3F2A7AC8617" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_9183BA012C213B597950F3F2A7AC3723" xlink:to="loc_us-gaap_EarningsPerShareDiluted_954C7DD88EF46DB1D0E2F3F2A7AC8617" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/NetIncomePerCommonShareTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/RestructuringAndRelatedCosts" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/RestructuringAndRelatedCostsCumulativeRestructuringAndRelatedChargesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_50EC2415ABDE003168FDF4A932E253D6" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3100A2CD7DBCA49642E5F4A932E25370" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_50EC2415ABDE003168FDF4A932E253D6" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3100A2CD7DBCA49642E5F4A932E25370" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_832BEBF594FCC9E5634FF4A932E2229A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3100A2CD7DBCA49642E5F4A932E25370" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_832BEBF594FCC9E5634FF4A932E2229A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_A4F75CE8BB68CECEE1C8F4A932E2875F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_832BEBF594FCC9E5634FF4A932E2229A" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_A4F75CE8BB68CECEE1C8F4A932E2875F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_A4F75CE8BB68CECEE1C8F4A932E2875F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_832BEBF594FCC9E5634FF4A932E2229A" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_A4F75CE8BB68CECEE1C8F4A932E2875F" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_ExternalSupportFeesMember" xlink:label="loc_abm_ExternalSupportFeesMember_04CB16DE5076B7E99910F4ACC474B694" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_A4F75CE8BB68CECEE1C8F4A932E2875F" xlink:to="loc_abm_ExternalSupportFeesMember_04CB16DE5076B7E99910F4ACC474B694" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeSeveranceMember" xlink:label="loc_us-gaap_EmployeeSeveranceMember_1744A606AA82602C51A7F4AD0573C806" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_A4F75CE8BB68CECEE1C8F4A932E2875F" xlink:to="loc_us-gaap_EmployeeSeveranceMember_1744A606AA82602C51A7F4AD0573C806" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_OtherProjectFeesMember" xlink:label="loc_abm_OtherProjectFeesMember_4E82D7EFB2E21AB4CA2FF4AD4EBBCF7E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_A4F75CE8BB68CECEE1C8F4A932E2875F" xlink:to="loc_abm_OtherProjectFeesMember_4E82D7EFB2E21AB4CA2FF4AD4EBBCF7E" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_LeaseExitMember" xlink:label="loc_abm_LeaseExitMember_823EC167136361B748DCF4AD8A928057" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_A4F75CE8BB68CECEE1C8F4A932E2875F" xlink:to="loc_abm_LeaseExitMember_823EC167136361B748DCF4AD8A928057" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_AssetImpairmentMember" xlink:label="loc_abm_AssetImpairmentMember_A29B929033DFD30C4CA4F4ADCF46F8AE" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_A4F75CE8BB68CECEE1C8F4A932E2875F" xlink:to="loc_abm_AssetImpairmentMember_A29B929033DFD30C4CA4F4ADCF46F8AE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestructuringPlanAxis" xlink:label="loc_us-gaap_RestructuringPlanAxis_8DDD20076E4564DAF2A2F4A932E2694C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_3100A2CD7DBCA49642E5F4A932E25370" xlink:to="loc_us-gaap_RestructuringPlanAxis_8DDD20076E4564DAF2A2F4A932E2694C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestructuringPlanDomain" xlink:label="loc_us-gaap_RestructuringPlanDomain_B21D2AF8CF291BA1398FF4A932E28FE1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_8DDD20076E4564DAF2A2F4A932E2694C" xlink:to="loc_us-gaap_RestructuringPlanDomain_B21D2AF8CF291BA1398FF4A932E28FE1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestructuringPlanDomain" xlink:label="loc_us-gaap_RestructuringPlanDomain_B21D2AF8CF291BA1398FF4A932E28FE1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_8DDD20076E4564DAF2A2F4A932E2694C" xlink:to="loc_us-gaap_RestructuringPlanDomain_B21D2AF8CF291BA1398FF4A932E28FE1" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_GCARestructuringProgramMember" xlink:label="loc_abm_GCARestructuringProgramMember_D0326F6020BF30DCE89EF4ABD0DA3B71" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_B21D2AF8CF291BA1398FF4A932E28FE1" xlink:to="loc_abm_GCARestructuringProgramMember_D0326F6020BF30DCE89EF4ABD0DA3B71" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_A2020VisionRestructuringProgramMember" xlink:label="loc_abm_A2020VisionRestructuringProgramMember_5A0A7B24C8C5942F13B2F4AC79856785" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_B21D2AF8CF291BA1398FF4A932E28FE1" xlink:to="loc_abm_A2020VisionRestructuringProgramMember_5A0A7B24C8C5942F13B2F4AC79856785" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestructuringAndRelatedCostCostIncurredToDate1" xlink:label="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_10D7376F9D32CCDAAC56F4AA22CACEA6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_50EC2415ABDE003168FDF4A932E253D6" xlink:to="loc_us-gaap_RestructuringAndRelatedCostCostIncurredToDate1_10D7376F9D32CCDAAC56F4AA22CACEA6" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/RestructuringAndRelatedCostsRestructuringAndRelatedLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestructuringCostAndReserveLineItems" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_2B9BE5F4A992E26A3B6BFC27D2A7D27A" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_E0F79D0CE223CE5490B8FC27D2A702AE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_2B9BE5F4A992E26A3B6BFC27D2A7D27A" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_E0F79D0CE223CE5490B8FC27D2A702AE" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestructuringCostAndReserveAxis" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_97529DAC8D961F5808E0FC27D2A7D0E1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_E0F79D0CE223CE5490B8FC27D2A702AE" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_97529DAC8D961F5808E0FC27D2A7D0E1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_366F8E618349C0A0DD3FFC27D2A7B770_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_97529DAC8D961F5808E0FC27D2A7D0E1" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_366F8E618349C0A0DD3FFC27D2A7B770_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_TypeOfRestructuringDomain" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_366F8E618349C0A0DD3FFC27D2A7B770" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_97529DAC8D961F5808E0FC27D2A7D0E1" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_366F8E618349C0A0DD3FFC27D2A7B770" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_EmployeeSeveranceMember" xlink:label="loc_us-gaap_EmployeeSeveranceMember_0332AD6B32E1220F81B6FC27D2A75547" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_366F8E618349C0A0DD3FFC27D2A7B770" xlink:to="loc_us-gaap_EmployeeSeveranceMember_0332AD6B32E1220F81B6FC27D2A75547" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_ExternalSupportFeesMember" xlink:label="loc_abm_ExternalSupportFeesMember_2632AA41163224EAFB42FC27D2A7B473" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_366F8E618349C0A0DD3FFC27D2A7B770" xlink:to="loc_abm_ExternalSupportFeesMember_2632AA41163224EAFB42FC27D2A7B473" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_LeaseExitMember" xlink:label="loc_abm_LeaseExitMember_51137F4FABC0A6590A15FC27D2A7E439" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_366F8E618349C0A0DD3FFC27D2A7B770" xlink:to="loc_abm_LeaseExitMember_51137F4FABC0A6590A15FC27D2A7E439" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_OtherProjectFeesMember" xlink:label="loc_abm_OtherProjectFeesMember_60967838D9367CDAD9C7FC27D2A79C20" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_366F8E618349C0A0DD3FFC27D2A7B770" xlink:to="loc_abm_OtherProjectFeesMember_60967838D9367CDAD9C7FC27D2A79C20" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestructuringReserveRollForward" xlink:label="loc_us-gaap_RestructuringReserveRollForward_8F1D6C6F17B8AE3BE66CFC27D2A7BFEA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_2B9BE5F4A992E26A3B6BFC27D2A7D27A" xlink:to="loc_us-gaap_RestructuringReserveRollForward_8F1D6C6F17B8AE3BE66CFC27D2A7BFEA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestructuringReserve" xlink:label="loc_us-gaap_RestructuringReserve_7C93430C2CF31B536828FC27D2A71230" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_8F1D6C6F17B8AE3BE66CFC27D2A7BFEA" xlink:to="loc_us-gaap_RestructuringReserve_7C93430C2CF31B536828FC27D2A71230" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestructuringCharges" xlink:label="loc_us-gaap_RestructuringCharges_A23CD5CBA98466381C2EFC27D2A78229" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_8F1D6C6F17B8AE3BE66CFC27D2A7BFEA" xlink:to="loc_us-gaap_RestructuringCharges_A23CD5CBA98466381C2EFC27D2A78229" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_PaymentsForRestructuring" xlink:label="loc_us-gaap_PaymentsForRestructuring_DF22EAB0E17F030B3F5EFC27D2A73D1B" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_8F1D6C6F17B8AE3BE66CFC27D2A7BFEA" xlink:to="loc_us-gaap_PaymentsForRestructuring_DF22EAB0E17F030B3F5EFC27D2A73D1B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_RestructuringReserveAccrualAdjustment1" xlink:label="loc_us-gaap_RestructuringReserveAccrualAdjustment1_B67EFC1F0B39D1982904FC27D2A78633" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_8F1D6C6F17B8AE3BE66CFC27D2A7BFEA" xlink:to="loc_us-gaap_RestructuringReserveAccrualAdjustment1_B67EFC1F0B39D1982904FC27D2A78633" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/RestructuringAndRelatedCostsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/SegmentInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/SegmentInformationFinancialInformationByReportableSegmentDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_9D52FC3CFA9BDC56F5B8F50000C044F6" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_91F79C2E116985645E91F50000BF22D8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_9D52FC3CFA9BDC56F5B8F50000C044F6" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_91F79C2E116985645E91F50000BF22D8" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_FB0FDA6B554E9E02DC71F50000BFC93B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_91F79C2E116985645E91F50000BF22D8" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_FB0FDA6B554E9E02DC71F50000BFC93B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_871F0E12584FF6E04C30F50000BFACCB_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_FB0FDA6B554E9E02DC71F50000BFC93B" xlink:to="loc_us-gaap_SegmentDomain_871F0E12584FF6E04C30F50000BFACCB_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_871F0E12584FF6E04C30F50000BFACCB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_FB0FDA6B554E9E02DC71F50000BFC93B" xlink:to="loc_us-gaap_SegmentDomain_871F0E12584FF6E04C30F50000BFACCB" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_BusinessandIndustryMember" xlink:label="loc_abm_BusinessandIndustryMember_60A31FAA2869B3833868F50000BFAFA3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_871F0E12584FF6E04C30F50000BFACCB" xlink:to="loc_abm_BusinessandIndustryMember_60A31FAA2869B3833868F50000BFAFA3" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_AviationMember" xlink:label="loc_abm_AviationMember_0CB365BE5F0A40A3A501F50000BF7844" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_871F0E12584FF6E04C30F50000BFACCB" xlink:to="loc_abm_AviationMember_0CB365BE5F0A40A3A501F50000BF7844" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_TechnologyAndManufacturingMember" xlink:label="loc_abm_TechnologyAndManufacturingMember_2E0470383F54139983C4F50745AB6EBB" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_871F0E12584FF6E04C30F50000BFACCB" xlink:to="loc_abm_TechnologyAndManufacturingMember_2E0470383F54139983C4F50745AB6EBB" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_EducationMember" xlink:label="loc_abm_EducationMember_C71D3303077E4A7C1FEDF5067D26DEDC" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_871F0E12584FF6E04C30F50000BFACCB" xlink:to="loc_abm_EducationMember_C71D3303077E4A7C1FEDF5067D26DEDC" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_TechnicalSolutionsMember" xlink:label="loc_abm_TechnicalSolutionsMember_4BBDFAD15844FF5722EFF50000BFDF6C" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_871F0E12584FF6E04C30F50000BFACCB" xlink:to="loc_abm_TechnicalSolutionsMember_4BBDFAD15844FF5722EFF50000BFDF6C" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_HealthcareMember" xlink:label="loc_abm_HealthcareMember_D7E8CC2E37ECB30BCAF5F50000C00908" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_871F0E12584FF6E04C30F50000BFACCB" xlink:to="loc_abm_HealthcareMember_D7E8CC2E37ECB30BCAF5F50000C00908" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_GovernmentServicesMember" xlink:label="loc_abm_GovernmentServicesMember_C2BE1A6F9987FB5431BCF50000C003A2" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_871F0E12584FF6E04C30F50000BFACCB" xlink:to="loc_abm_GovernmentServicesMember_C2BE1A6F9987FB5431BCF50000C003A2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConsolidationItemsAxis" xlink:label="loc_us-gaap_ConsolidationItemsAxis_1048E2F2E93E105A30FCF50000C0FDB7" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_91F79C2E116985645E91F50000BF22D8" xlink:to="loc_us-gaap_ConsolidationItemsAxis_1048E2F2E93E105A30FCF50000C0FDB7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="loc_us-gaap_ConsolidationItemsDomain_26961A5A26E7DD54E7ADF50000C0928C_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConsolidationItemsAxis_1048E2F2E93E105A30FCF50000C0FDB7" xlink:to="loc_us-gaap_ConsolidationItemsDomain_26961A5A26E7DD54E7ADF50000C0928C_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_ConsolidationItemsDomain" xlink:label="loc_us-gaap_ConsolidationItemsDomain_26961A5A26E7DD54E7ADF50000C0928C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConsolidationItemsAxis_1048E2F2E93E105A30FCF50000C0FDB7" xlink:to="loc_us-gaap_ConsolidationItemsDomain_26961A5A26E7DD54E7ADF50000C0928C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingSegmentsMember" xlink:label="loc_us-gaap_OperatingSegmentsMember_B186D42A985B8427D41BF50000C01FBF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConsolidationItemsDomain_26961A5A26E7DD54E7ADF50000C0928C" xlink:to="loc_us-gaap_OperatingSegmentsMember_B186D42A985B8427D41BF50000C01FBF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_CorporateNonSegmentMember" xlink:label="loc_us-gaap_CorporateNonSegmentMember_9E04C966815F1DFD13E3F50000C078A1" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConsolidationItemsDomain_26961A5A26E7DD54E7ADF50000C0928C" xlink:to="loc_us-gaap_CorporateNonSegmentMember_9E04C966815F1DFD13E3F50000C078A1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_MaterialReconcilingItemsMember" xlink:label="loc_us-gaap_MaterialReconcilingItemsMember_FDB33CA2DE84DB4D3503F50000C02BB6" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConsolidationItemsDomain_26961A5A26E7DD54E7ADF50000C0928C" xlink:to="loc_us-gaap_MaterialReconcilingItemsMember_FDB33CA2DE84DB4D3503F50000C02BB6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentReportingInformationRevenueAbstract" xlink:label="loc_us-gaap_SegmentReportingInformationRevenueAbstract_E5B97C0867056C041E5CF50DD267AAA6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_9D52FC3CFA9BDC56F5B8F50000C044F6" xlink:to="loc_us-gaap_SegmentReportingInformationRevenueAbstract_E5B97C0867056C041E5CF50DD267AAA6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SalesRevenueServicesNet" xlink:label="loc_us-gaap_SalesRevenueServicesNet_D6031852B87B5F1493D4F50000C023F9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationRevenueAbstract_E5B97C0867056C041E5CF50DD267AAA6" xlink:to="loc_us-gaap_SalesRevenueServicesNet_D6031852B87B5F1493D4F50000C023F9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_SegmentReportingInformationProfitLossAbstract" xlink:label="loc_us-gaap_SegmentReportingInformationProfitLossAbstract_4955CE1EAA0CB83E4745F50EB4A7B8E2" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_9D52FC3CFA9BDC56F5B8F50000C044F6" xlink:to="loc_us-gaap_SegmentReportingInformationProfitLossAbstract_4955CE1EAA0CB83E4745F50EB4A7B8E2" xlink:type="arc" />
    <link:loc xlink:href="abm-20180131.xsd#abm_EnergyEfficientGovernmentBuildingsTaxCreditsAmount" xlink:label="loc_abm_EnergyEfficientGovernmentBuildingsTaxCreditsAmount_497267264B253B9565E1F50000C0237F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationProfitLossAbstract_4955CE1EAA0CB83E4745F50EB4A7B8E2" xlink:to="loc_abm_EnergyEfficientGovernmentBuildingsTaxCreditsAmount_497267264B253B9565E1F50000C0237F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_A708C5DED5B3328B7EDCF50000C0F60F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationProfitLossAbstract_4955CE1EAA0CB83E4745F50EB4A7B8E2" xlink:to="loc_us-gaap_OperatingIncomeLoss_A708C5DED5B3328B7EDCF50000C0F60F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_6D2E439EFF8B8BDFBD3AF50000C04CB8" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_9D52FC3CFA9BDC56F5B8F50000C044F6" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_6D2E439EFF8B8BDFBD3AF50000C04CB8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_09D8C0C410230F5B44D0F50000C0908A" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_9D52FC3CFA9BDC56F5B8F50000C044F6" xlink:to="loc_us-gaap_InterestExpense_09D8C0C410230F5B44D0F50000C0908A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2017/elts/us-gaap-2017-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_A9B85D5C997D16827AB4F50000C05BEF" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_9D52FC3CFA9BDC56F5B8F50000C044F6" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_A9B85D5C997D16827AB4F50000C05BEF" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.abm.com/role/SegmentInformationTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.abm.com/role/SubsequentEvents" xlink:type="extended" />
</link:linkbase>
