<?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.dxpe.com/role/CommitmentsAndContingencies" xlink:href="dxpe-20190630.xsd#CommitmentsAndContingencies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/Company" xlink:href="dxpe-20190630.xsd#Company" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/CompanyDetails" xlink:href="dxpe-20190630.xsd#CompanyDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/CondensedConsolidatedBalanceSheets" xlink:href="dxpe-20190630.xsd#CondensedConsolidatedBalanceSheets" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:href="dxpe-20190630.xsd#CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/CondensedConsolidatedStatementsOfCashFlows" xlink:href="dxpe-20190630.xsd#CondensedConsolidatedStatementsOfCashFlows" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/CondensedConsolidatedStatementsOfEquity" xlink:href="dxpe-20190630.xsd#CondensedConsolidatedStatementsOfEquity" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveIncome" xlink:href="dxpe-20190630.xsd#CondensedConsolidatedStatementsOfOperationsAndComprehensiveIncome" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/CostsAndEstimatedProfitsOnUncompletedContracts" xlink:href="dxpe-20190630.xsd#CostsAndEstimatedProfitsOnUncompletedContracts" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/CostsAndEstimatedProfitsOnUncompletedContractsDetails" xlink:href="dxpe-20190630.xsd#CostsAndEstimatedProfitsOnUncompletedContractsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/CostsAndEstimatedProfitsOnUncompletedContractsTables" xlink:href="dxpe-20190630.xsd#CostsAndEstimatedProfitsOnUncompletedContractsTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/DocumentAndEntityInformation" xlink:href="dxpe-20190630.xsd#DocumentAndEntityInformation" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/EarningsPerShareData" xlink:href="dxpe-20190630.xsd#EarningsPerShareData" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/EarningsPerShareDataDetails" xlink:href="dxpe-20190630.xsd#EarningsPerShareDataDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/EarningsPerShareDataTables" xlink:href="dxpe-20190630.xsd#EarningsPerShareDataTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/FairValueOfFinancialAssetsAndLiabilities" xlink:href="dxpe-20190630.xsd#FairValueOfFinancialAssetsAndLiabilities" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" xlink:href="dxpe-20190630.xsd#FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/FairValueOfFinancialAssetsAndLiabilitiesQuantitativeInformationAboutLevel3Details" xlink:href="dxpe-20190630.xsd#FairValueOfFinancialAssetsAndLiabilitiesQuantitativeInformationAboutLevel3Details" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/FairValueOfFinancialAssetsAndLiabilitiesReconciliationOfBeginningAndEndingBalancesDetails" xlink:href="dxpe-20190630.xsd#FairValueOfFinancialAssetsAndLiabilitiesReconciliationOfBeginningAndEndingBalancesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/FairValueOfFinancialAssetsAndLiabilitiesTables" xlink:href="dxpe-20190630.xsd#FairValueOfFinancialAssetsAndLiabilitiesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/IncomeTaxes" xlink:href="dxpe-20190630.xsd#IncomeTaxes" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/IncomeTaxesDetails" xlink:href="dxpe-20190630.xsd#IncomeTaxesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/Inventories" xlink:href="dxpe-20190630.xsd#Inventories" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/InventoriesDetails" xlink:href="dxpe-20190630.xsd#InventoriesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/InventoriesTables" xlink:href="dxpe-20190630.xsd#InventoriesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/Leases" xlink:href="dxpe-20190630.xsd#Leases" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LeasesContractualObligationsRelatedToOperatingLeasesUnderAsc840Details" xlink:href="dxpe-20190630.xsd#LeasesContractualObligationsRelatedToOperatingLeasesUnderAsc840Details" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LeasesLeaseExpenseDetails" xlink:href="dxpe-20190630.xsd#LeasesLeaseExpenseDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LeasesLeaseTermAndDiscountRateDetails" xlink:href="dxpe-20190630.xsd#LeasesLeaseTermAndDiscountRateDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LeasesMaturityOfLeaseLiabilitiesDetails" xlink:href="dxpe-20190630.xsd#LeasesMaturityOfLeaseLiabilitiesDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LeasesNarrativeDetails" xlink:href="dxpe-20190630.xsd#LeasesNarrativeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LeasesSupplementalBalanceSheetInformationDetails" xlink:href="dxpe-20190630.xsd#LeasesSupplementalBalanceSheetInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LeasesSupplementalCashFlowInformationDetails" xlink:href="dxpe-20190630.xsd#LeasesSupplementalCashFlowInformationDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LeasesTables" xlink:href="dxpe-20190630.xsd#LeasesTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LongTermDebt" xlink:href="dxpe-20190630.xsd#LongTermDebt" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LongTermDebtDetails" xlink:href="dxpe-20190630.xsd#LongTermDebtDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/LongTermDebtTables" xlink:href="dxpe-20190630.xsd#LongTermDebtTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/RecentAccountingPronouncements" xlink:href="dxpe-20190630.xsd#RecentAccountingPronouncements" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/RecentAccountingPronouncementsPolicies" xlink:href="dxpe-20190630.xsd#RecentAccountingPronouncementsPolicies" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/SegmentReporting" xlink:href="dxpe-20190630.xsd#SegmentReporting" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/SegmentReportingFinancialInformationOfCompanysSegmentsDetails" xlink:href="dxpe-20190630.xsd#SegmentReportingFinancialInformationOfCompanysSegmentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/SegmentReportingIdentifiableAssetsBySegmentsDetails" xlink:href="dxpe-20190630.xsd#SegmentReportingIdentifiableAssetsBySegmentsDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/SegmentReportingReconciliationOfOperatingIncomeToConsolidatedIncomeDetails" xlink:href="dxpe-20190630.xsd#SegmentReportingReconciliationOfOperatingIncomeToConsolidatedIncomeDetails" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/SegmentReportingTables" xlink:href="dxpe-20190630.xsd#SegmentReportingTables" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/SubsequentEvents" xlink:href="dxpe-20190630.xsd#SubsequentEvents" xlink:type="simple" />
  <link:roleRef roleURI="http://www.dxpe.com/role/SummaryOfSignificantAccountingAndBusinessPolicies" xlink:href="dxpe-20190630.xsd#SummaryOfSignificantAccountingAndBusinessPolicies" 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.dxpe.com/role/CommitmentsAndContingencies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/Company" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/CompanyDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/CondensedConsolidatedBalanceSheets" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/CondensedConsolidatedBalanceSheetsParenthetical" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_18A4B9A21AD6C2FBB51A651ACF65433C" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_F40174A3AD82A9A09A3A651ACF651AFA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_18A4B9A21AD6C2FBB51A651ACF65433C" xlink:to="loc_us-gaap_StatementTable_F40174A3AD82A9A09A3A651ACF651AFA" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_DC69838538472870F760651ACF65A312" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_F40174A3AD82A9A09A3A651ACF651AFA" xlink:to="loc_us-gaap_StatementClassOfStockAxis_DC69838538472870F760651ACF65A312" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_06AF4A887C89D28E783A651ACF65DAF6_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_DC69838538472870F760651ACF65A312" xlink:to="loc_us-gaap_ClassOfStockDomain_06AF4A887C89D28E783A651ACF65DAF6_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_06AF4A887C89D28E783A651ACF65DAF6" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_DC69838538472870F760651ACF65A312" xlink:to="loc_us-gaap_ClassOfStockDomain_06AF4A887C89D28E783A651ACF65DAF6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SeriesAPreferredStockMember" xlink:label="loc_us-gaap_SeriesAPreferredStockMember_E53E170F2E95DA08DEFE651ACF65A21F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_06AF4A887C89D28E783A651ACF65DAF6" xlink:to="loc_us-gaap_SeriesAPreferredStockMember_E53E170F2E95DA08DEFE651ACF65A21F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ConvertiblePreferredStockMember" xlink:label="loc_us-gaap_ConvertiblePreferredStockMember_95120878CC9688F84733651ACF654E8B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_06AF4A887C89D28E783A651ACF65DAF6" xlink:to="loc_us-gaap_ConvertiblePreferredStockMember_95120878CC9688F84733651ACF654E8B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetsAbstract" xlink:label="loc_us-gaap_AssetsAbstract_3FE57AB501D710D73A6F651ACF65D42B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_18A4B9A21AD6C2FBB51A651ACF65433C" xlink:to="loc_us-gaap_AssetsAbstract_3FE57AB501D710D73A6F651ACF65D42B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AssetsCurrentAbstract" xlink:label="loc_us-gaap_AssetsCurrentAbstract_F3945192DDB379C51297651ACF654DC2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_3FE57AB501D710D73A6F651ACF65D42B" xlink:to="loc_us-gaap_AssetsCurrentAbstract_F3945192DDB379C51297651ACF654DC2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_967E740C7ACECE3E3173651ACF65F53D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_F3945192DDB379C51297651ACF654DC2" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_967E740C7ACECE3E3173651ACF65F53D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_31642F927B29C63AE144651ACF65E8C0" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_18A4B9A21AD6C2FBB51A651ACF65433C" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_31642F927B29C63AE144651ACF65E8C0" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_8EDB7C39FE2B2470A01A651ACF6557DE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_31642F927B29C63AE144651ACF65E8C0" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_8EDB7C39FE2B2470A01A651ACF6557DE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PreferredStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_PreferredStockParOrStatedValuePerShare_5FD9ACA25AB30E9C3406651ACF65C06D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_8EDB7C39FE2B2470A01A651ACF6557DE" xlink:to="loc_us-gaap_PreferredStockParOrStatedValuePerShare_5FD9ACA25AB30E9C3406651ACF65C06D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PreferredStockSharesAuthorized" xlink:label="loc_us-gaap_PreferredStockSharesAuthorized_1477BE47DEB480495133651ACF653D5C" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_8EDB7C39FE2B2470A01A651ACF6557DE" xlink:to="loc_us-gaap_PreferredStockSharesAuthorized_1477BE47DEB480495133651ACF653D5C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_334FEAB5B776C1BC416B651ACF65079E" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_8EDB7C39FE2B2470A01A651ACF6557DE" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_334FEAB5B776C1BC416B651ACF65079E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockSharesAuthorized" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_2005B7D8F5E62949D6C9651ACF655BA9" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_8EDB7C39FE2B2470A01A651ACF6557DE" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_2005B7D8F5E62949D6C9651ACF655BA9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockSharesIssued" xlink:label="loc_us-gaap_CommonStockSharesIssued_9F11DE3E7B414104A64B651ACF652A2B" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_8EDB7C39FE2B2470A01A651ACF6557DE" xlink:to="loc_us-gaap_CommonStockSharesIssued_9F11DE3E7B414104A64B651ACF652A2B" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.dxpe.com/role/CondensedConsolidatedStatementsOfCashFlows" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/CondensedConsolidatedStatementsOfEquity" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementLineItems" xlink:label="loc_us-gaap_StatementLineItems_78FFCE51A3B93FB637FA687F9B3C0651" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementTable" xlink:label="loc_us-gaap_StatementTable_0EA832E572A9DEBF8386687F9B3C06D0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_78FFCE51A3B93FB637FA687F9B3C0651" xlink:to="loc_us-gaap_StatementTable_0EA832E572A9DEBF8386687F9B3C06D0" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementClassOfStockAxis" xlink:label="loc_us-gaap_StatementClassOfStockAxis_7AA3644ACC36AFD0E896687F9B3CE623" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_0EA832E572A9DEBF8386687F9B3C06D0" xlink:to="loc_us-gaap_StatementClassOfStockAxis_7AA3644ACC36AFD0E896687F9B3CE623" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_39324A10F92DF6502CDF687F9B3CC640_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_7AA3644ACC36AFD0E896687F9B3CE623" xlink:to="loc_us-gaap_ClassOfStockDomain_39324A10F92DF6502CDF687F9B3CC640_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ClassOfStockDomain" xlink:label="loc_us-gaap_ClassOfStockDomain_39324A10F92DF6502CDF687F9B3CC640" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_7AA3644ACC36AFD0E896687F9B3CE623" xlink:to="loc_us-gaap_ClassOfStockDomain_39324A10F92DF6502CDF687F9B3CC640" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SeriesAPreferredStockMember" xlink:label="loc_us-gaap_SeriesAPreferredStockMember_D129F0116F093CB1DF5F687F9B3C5220" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_39324A10F92DF6502CDF687F9B3CC640" xlink:to="loc_us-gaap_SeriesAPreferredStockMember_D129F0116F093CB1DF5F687F9B3C5220" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SeriesBPreferredStockMember" xlink:label="loc_us-gaap_SeriesBPreferredStockMember_3CF30C910242A5C56AB9687F9B3C067E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_39324A10F92DF6502CDF687F9B3CC640" xlink:to="loc_us-gaap_SeriesBPreferredStockMember_3CF30C910242A5C56AB9687F9B3C067E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementEquityComponentsAxis" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_8B8C1035362243368E0D687F9B3C6B84" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_0EA832E572A9DEBF8386687F9B3C06D0" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_8B8C1035362243368E0D687F9B3C6B84" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_6A3C28B66528A2518189687F9B3CAA7E_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_8B8C1035362243368E0D687F9B3C6B84" xlink:to="loc_us-gaap_EquityComponentDomain_6A3C28B66528A2518189687F9B3CAA7E_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EquityComponentDomain" xlink:label="loc_us-gaap_EquityComponentDomain_6A3C28B66528A2518189687F9B3CAA7E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_8B8C1035362243368E0D687F9B3C6B84" xlink:to="loc_us-gaap_EquityComponentDomain_6A3C28B66528A2518189687F9B3CAA7E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CommonStockMember" xlink:label="loc_us-gaap_CommonStockMember_D218956101B4B40E39FC687F9B3C37DE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_6A3C28B66528A2518189687F9B3CAA7E" xlink:to="loc_us-gaap_CommonStockMember_D218956101B4B40E39FC687F9B3C37DE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdditionalPaidInCapitalMember" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_B5E14C8B8D87E74F3995687F9B3C15F8" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_6A3C28B66528A2518189687F9B3CAA7E" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_B5E14C8B8D87E74F3995687F9B3C15F8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RetainedEarningsMember" xlink:label="loc_us-gaap_RetainedEarningsMember_ED87812B42B7D278C6EB687F9B3C3DAE" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_6A3C28B66528A2518189687F9B3CAA7E" xlink:to="loc_us-gaap_RetainedEarningsMember_ED87812B42B7D278C6EB687F9B3C3DAE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NoncontrollingInterestMember" xlink:label="loc_us-gaap_NoncontrollingInterestMember_8FE9A2D41B03464B9392687F9B3C4D9F" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_6A3C28B66528A2518189687F9B3CAA7E" xlink:to="loc_us-gaap_NoncontrollingInterestMember_8FE9A2D41B03464B9392687F9B3C4D9F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_99BB20B9DA2A7479C85D687F9B3CB14B" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_6A3C28B66528A2518189687F9B3CAA7E" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_99BB20B9DA2A7479C85D687F9B3CB14B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_C24E61A112B523B8ADC1687F9B3CD0D7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_78FFCE51A3B93FB637FA687F9B3C0651" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_C24E61A112B523B8ADC1687F9B3CD0D7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_6A54EA6993F9F6A0068F687F9B3C197B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_C24E61A112B523B8ADC1687F9B3CD0D7" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_6A54EA6993F9F6A0068F687F9B3C197B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DividendsPreferredStock" xlink:label="loc_us-gaap_DividendsPreferredStock_D92FA2B546BC281E6E08687F9B3C5633" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_C24E61A112B523B8ADC1687F9B3CD0D7" xlink:to="loc_us-gaap_DividendsPreferredStock_D92FA2B546BC281E6E08687F9B3C5633" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition_F390B754E5024F1D7451687F9B3C1DD3" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_C24E61A112B523B8ADC1687F9B3CD0D7" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationRestrictedStockUnitsRequisiteServicePeriodRecognition_F390B754E5024F1D7451687F9B3C1DD3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet" xlink:label="loc_us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet_B060ACA29BBCF6048934687F9B3C5DFE" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_C24E61A112B523B8ADC1687F9B3CD0D7" xlink:to="loc_us-gaap_AdjustmentToAdditionalPaidInCapitalIncomeTaxEffectFromShareBasedCompensationNet_B060ACA29BBCF6048934687F9B3C5DFE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueNewIssues" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_1EC14C0619B9CC88B5D3687F9B3CD8C9" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_C24E61A112B523B8ADC1687F9B3CD0D7" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueNewIssues_1EC14C0619B9CC88B5D3687F9B3CD8C9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CumulativeTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease" xlink:label="loc_us-gaap_CumulativeTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease_8B5150B5271F7F243477687F9B3CA787" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_C24E61A112B523B8ADC1687F9B3CD0D7" xlink:to="loc_us-gaap_CumulativeTranslationAdjustmentNetOfTaxPeriodIncreaseDecrease_8B5150B5271F7F243477687F9B3CA787" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProfitLoss" xlink:label="loc_us-gaap_ProfitLoss_ADF281C3C0DF90DE9D3D687F9B3CA3CF" xlink:type="locator" />
    <link:definitionArc order="7" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_C24E61A112B523B8ADC1687F9B3CD0D7" xlink:to="loc_us-gaap_ProfitLoss_ADF281C3C0DF90DE9D3D687F9B3CA3CF" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.dxpe.com/role/CondensedConsolidatedStatementsOfOperationsAndComprehensiveIncome" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/CostsAndEstimatedProfitsOnUncompletedContracts" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/CostsAndEstimatedProfitsOnUncompletedContractsDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/CostsAndEstimatedProfitsOnUncompletedContractsTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/DocumentAndEntityInformation" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/EarningsPerShareData" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/EarningsPerShareDataDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/EarningsPerShareDataTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/FairValueOfFinancialAssetsAndLiabilities" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/FairValueOfFinancialAssetsAndLiabilitiesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7648DB70D63BE90399985426391483DC" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_AA04138F5AC2AE878B4C542639106D9F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7648DB70D63BE90399985426391483DC" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_AA04138F5AC2AE878B4C542639106D9F" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessAcquisitionAxis" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_2C6DA19D96CFC17ED00F542639106564" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_AA04138F5AC2AE878B4C542639106D9F" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_2C6DA19D96CFC17ED00F542639106564" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_BED902EA1025B6BECDD7542639101FAA_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_2C6DA19D96CFC17ED00F542639106564" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_BED902EA1025B6BECDD7542639101FAA_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_BED902EA1025B6BECDD7542639101FAA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_2C6DA19D96CFC17ED00F542639106564" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_BED902EA1025B6BECDD7542639101FAA" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_ApplicationSpecialtiesIncMember" xlink:label="loc_dxpe_ApplicationSpecialtiesIncMember_7900533E369518DDACE754263911A3F8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_BED902EA1025B6BECDD7542639101FAA" xlink:to="loc_dxpe_ApplicationSpecialtiesIncMember_7900533E369518DDACE754263911A3F8" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationAxis" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_FCE3278CB36EE85C61F454263911C614" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_AA04138F5AC2AE878B4C542639106D9F" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_FCE3278CB36EE85C61F454263911C614" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_5177777411D03A4CA098542639118FEC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_FCE3278CB36EE85C61F454263911C614" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_5177777411D03A4CA098542639118FEC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BalanceSheetLocationDomain" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_5177777411D03A4CA098542639118FEC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_FCE3278CB36EE85C61F454263911C614" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_5177777411D03A4CA098542639118FEC" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_OtherCurrentandNoncurrentLiabilitiesMember" xlink:label="loc_dxpe_OtherCurrentandNoncurrentLiabilitiesMember_A2B01CB395498A17C86454263911EE02" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_5177777411D03A4CA098542639118FEC" xlink:to="loc_dxpe_OtherCurrentandNoncurrentLiabilitiesMember_A2B01CB395498A17C86454263911EE02" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ValuationTechniqueAxis" xlink:label="loc_us-gaap_ValuationTechniqueAxis_747FF2227530F2EBF10D542639112E93" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_AA04138F5AC2AE878B4C542639106D9F" xlink:to="loc_us-gaap_ValuationTechniqueAxis_747FF2227530F2EBF10D542639112E93" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ValuationTechniqueDomain" xlink:label="loc_us-gaap_ValuationTechniqueDomain_93BFCC1A4322B8D0EDCB54263912C921_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_747FF2227530F2EBF10D542639112E93" xlink:to="loc_us-gaap_ValuationTechniqueDomain_93BFCC1A4322B8D0EDCB54263912C921_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ValuationTechniqueDomain" xlink:label="loc_us-gaap_ValuationTechniqueDomain_93BFCC1A4322B8D0EDCB54263912C921" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_747FF2227530F2EBF10D542639112E93" xlink:to="loc_us-gaap_ValuationTechniqueDomain_93BFCC1A4322B8D0EDCB54263912C921" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ValuationTechniqueDiscountedCashFlowMember" xlink:label="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_03C34D34D89F1446923D54263912884D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_93BFCC1A4322B8D0EDCB54263912C921" xlink:to="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_03C34D34D89F1446923D54263912884D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_219D3954AA24001BC4F9542639128E92" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_AA04138F5AC2AE878B4C542639106D9F" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_219D3954AA24001BC4F9542639128E92" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1BB6EB59F5EDABAA28BD5426391240D3_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_219D3954AA24001BC4F9542639128E92" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1BB6EB59F5EDABAA28BD5426391240D3_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1BB6EB59F5EDABAA28BD5426391240D3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_219D3954AA24001BC4F9542639128E92" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1BB6EB59F5EDABAA28BD5426391240D3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_3B02B3731218EF34409F5426391326B3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_1BB6EB59F5EDABAA28BD5426391240D3" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_3B02B3731218EF34409F5426391326B3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MeasurementInputTypeAxis" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_867F187FFF9C17874F7754263913C3A9" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_AA04138F5AC2AE878B4C542639106D9F" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_867F187FFF9C17874F7754263913C3A9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MeasurementInputTypeDomain" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_B9FE02E7119655629D4854263913ABF3_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_867F187FFF9C17874F7754263913C3A9" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_B9FE02E7119655629D4854263913ABF3_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MeasurementInputTypeDomain" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_B9FE02E7119655629D4854263913ABF3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_867F187FFF9C17874F7754263913C3A9" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_B9FE02E7119655629D4854263913ABF3" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_AnnualizedEBITDAAndProbabilityOfAchievementMember" xlink:label="loc_dxpe_AnnualizedEBITDAAndProbabilityOfAchievementMember_7F65FF8A60F5F249BEC5542639132E3A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_B9FE02E7119655629D4854263913ABF3" xlink:to="loc_dxpe_AnnualizedEBITDAAndProbabilityOfAchievementMember_7F65FF8A60F5F249BEC5542639132E3A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_A60A233269301D9F1E575426391453DF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7648DB70D63BE90399985426391483DC" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_A60A233269301D9F1E575426391453DF" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_12012BD7B271E11237BE5426391432F9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_7648DB70D63BE90399985426391483DC" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput_12012BD7B271E11237BE5426391432F9" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.dxpe.com/role/FairValueOfFinancialAssetsAndLiabilitiesQuantitativeInformationAboutLevel3Details" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_710120F18E853DAFBC725426216DD575" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_8B778F927A076EEACF8D54262169F9C3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_710120F18E853DAFBC725426216DD575" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_8B778F927A076EEACF8D54262169F9C3" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_B1AA0EAAF4D0BE1D00755426216A3FFC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_8B778F927A076EEACF8D54262169F9C3" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_B1AA0EAAF4D0BE1D00755426216A3FFC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4B456F9A5F586642CE1C5426216AC7D1_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_B1AA0EAAF4D0BE1D00755426216A3FFC" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4B456F9A5F586642CE1C5426216AC7D1_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4B456F9A5F586642CE1C5426216AC7D1" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_B1AA0EAAF4D0BE1D00755426216A3FFC" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4B456F9A5F586642CE1C5426216AC7D1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_ECFEDA18C13F886B69AB5426216A093F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4B456F9A5F586642CE1C5426216AC7D1" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_ECFEDA18C13F886B69AB5426216A093F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ValuationTechniqueAxis" xlink:label="loc_us-gaap_ValuationTechniqueAxis_01A574C872BA0CC74A6E5426216B87CD" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_8B778F927A076EEACF8D54262169F9C3" xlink:to="loc_us-gaap_ValuationTechniqueAxis_01A574C872BA0CC74A6E5426216B87CD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ValuationTechniqueDomain" xlink:label="loc_us-gaap_ValuationTechniqueDomain_4CBBF07C377317A162955426216B8B73_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_01A574C872BA0CC74A6E5426216B87CD" xlink:to="loc_us-gaap_ValuationTechniqueDomain_4CBBF07C377317A162955426216B8B73_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ValuationTechniqueDomain" xlink:label="loc_us-gaap_ValuationTechniqueDomain_4CBBF07C377317A162955426216B8B73" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_01A574C872BA0CC74A6E5426216B87CD" xlink:to="loc_us-gaap_ValuationTechniqueDomain_4CBBF07C377317A162955426216B8B73" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ValuationTechniqueDiscountedCashFlowMember" xlink:label="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_72864AD8BDDE334F20FC5426216C50FC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_4CBBF07C377317A162955426216B8B73" xlink:to="loc_us-gaap_ValuationTechniqueDiscountedCashFlowMember_72864AD8BDDE334F20FC5426216C50FC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MeasurementInputTypeAxis" xlink:label="loc_us-gaap_MeasurementInputTypeAxis_94B87CE1D72C0A87D76B5426216C5619" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_8B778F927A076EEACF8D54262169F9C3" xlink:to="loc_us-gaap_MeasurementInputTypeAxis_94B87CE1D72C0A87D76B5426216C5619" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MeasurementInputTypeDomain" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_74580695CB3ED36131175426216C4A47_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_94B87CE1D72C0A87D76B5426216C5619" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_74580695CB3ED36131175426216C4A47_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MeasurementInputTypeDomain" xlink:label="loc_us-gaap_MeasurementInputTypeDomain_74580695CB3ED36131175426216C4A47" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_MeasurementInputTypeAxis_94B87CE1D72C0A87D76B5426216C5619" xlink:to="loc_us-gaap_MeasurementInputTypeDomain_74580695CB3ED36131175426216C4A47" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_AnnualizedEBITDAAndProbabilityOfAchievementMember" xlink:label="loc_dxpe_AnnualizedEBITDAAndProbabilityOfAchievementMember_F59A4793FA366AC3B80C5426216C3EDA" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_MeasurementInputTypeDomain_74580695CB3ED36131175426216C4A47" xlink:to="loc_dxpe_AnnualizedEBITDAAndProbabilityOfAchievementMember_F59A4793FA366AC3B80C5426216C3EDA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueInputsQuantitativeInformationAbstract" xlink:label="loc_us-gaap_FairValueInputsQuantitativeInformationAbstract_7CCAA0343C870755DB1C5426216DAE63" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_710120F18E853DAFBC725426216DD575" xlink:to="loc_us-gaap_FairValueInputsQuantitativeInformationAbstract_7CCAA0343C870755DB1C5426216DAE63" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_BusinessCombinationContingentConsiderationLiability" xlink:label="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_192685179447E07F60AD5426216DDDEB" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueInputsQuantitativeInformationAbstract_7CCAA0343C870755DB1C5426216DAE63" xlink:to="loc_us-gaap_BusinessCombinationContingentConsiderationLiability_192685179447E07F60AD5426216DDDEB" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.dxpe.com/role/FairValueOfFinancialAssetsAndLiabilitiesReconciliationOfBeginningAndEndingBalancesDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_34E832616D261B4E036C651ACE7BE3CA" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_A15FBB0255FAD6BF3042651ACE7BEA5A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_34E832616D261B4E036C651ACE7BE3CA" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_A15FBB0255FAD6BF3042651ACE7BEA5A" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_CAD41053F6BEB70D639C651ACE7B495E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_A15FBB0255FAD6BF3042651ACE7BEA5A" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_CAD41053F6BEB70D639C651ACE7B495E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_688F4F4D1A59B884040B651ACE7B437D_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_CAD41053F6BEB70D639C651ACE7B495E" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_688F4F4D1A59B884040B651ACE7B437D_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_688F4F4D1A59B884040B651ACE7B437D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_CAD41053F6BEB70D639C651ACE7B495E" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_688F4F4D1A59B884040B651ACE7B437D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_10D7D0CA84D7B0554BBB651ACE7B5310" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_688F4F4D1A59B884040B651ACE7B437D" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_10D7D0CA84D7B0554BBB651ACE7B5310" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_702C42B38EEA7A4DEB26651ACE7B848E" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_A15FBB0255FAD6BF3042651ACE7BEA5A" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_702C42B38EEA7A4DEB26651ACE7B848E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_DB55A08D2C748BCB175D651ACE7B16B7_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_702C42B38EEA7A4DEB26651ACE7B848E" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_DB55A08D2C748BCB175D651ACE7B16B7_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_DB55A08D2C748BCB175D651ACE7B16B7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_702C42B38EEA7A4DEB26651ACE7B848E" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_DB55A08D2C748BCB175D651ACE7B16B7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueInputsLevel3Member" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_D1C2FB7AEAE675F39FA2651ACE7BBA1A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_DB55A08D2C748BCB175D651ACE7B16B7" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_D1C2FB7AEAE675F39FA2651ACE7BBA1A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByLiabilityClassAxis" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_D460BE1B20178BE9F13D651ACE7BDFC5" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationTable_A15FBB0255FAD6BF3042651ACE7BEA5A" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_D460BE1B20178BE9F13D651ACE7BDFC5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_84367CF403FC5057B428651ACE7B549F_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_D460BE1B20178BE9F13D651ACE7BDFC5" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_84367CF403FC5057B428651ACE7B549F_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_84367CF403FC5057B428651ACE7B549F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_D460BE1B20178BE9F13D651ACE7BDFC5" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_84367CF403FC5057B428651ACE7B549F" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_ContingentConsiderationLiabilityMember" xlink:label="loc_dxpe_ContingentConsiderationLiabilityMember_E3775F726C01DB380BE6651ACE7BDC5D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_84367CF403FC5057B428651ACE7B549F" xlink:to="loc_dxpe_ContingentConsiderationLiabilityMember_E3775F726C01DB380BE6651ACE7BDC5D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_E38905D8548C20D640D0651ACE7BDE6D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_34E832616D261B4E036C651ACE7BE3CA" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_E38905D8548C20D640D0651ACE7BDE6D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_C1271FFA62E6B56EFFCA651ACE7BB16A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_E38905D8548C20D640D0651ACE7BDE6D" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue_C1271FFA62E6B56EFFCA651ACE7BB16A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlementsAbstract" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlementsAbstract_C009B1D04031EC4AF932651ACE7B083D" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_E38905D8548C20D640D0651ACE7BDE6D" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlementsAbstract_C009B1D04031EC4AF932651ACE7B083D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_36474EED935236B05FB6651ACE7B5C5E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlementsAbstract_C009B1D04031EC4AF932651ACE7B083D" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases_36474EED935236B05FB6651ACE7B5C5E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_388CC01FEF02FC269AB9651ACE7B40CA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchasesSalesIssuancesSettlementsAbstract_C009B1D04031EC4AF932651ACE7B083D" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements_388CC01FEF02FC269AB9651ACE7B40CA" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_RemeasurementAdjustmentsAbstract" xlink:label="loc_dxpe_RemeasurementAdjustmentsAbstract_A98AE6A7751749F04170651ACE7B3728" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_E38905D8548C20D640D0651ACE7BDE6D" xlink:to="loc_dxpe_RemeasurementAdjustmentsAbstract_A98AE6A7751749F04170651ACE7B3728" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings" xlink:label="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_0683672FDC2ECDAC3384651ACE7B28C5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dxpe_RemeasurementAdjustmentsAbstract_A98AE6A7751749F04170651ACE7B3728" xlink:to="loc_us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings_0683672FDC2ECDAC3384651ACE7B28C5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_52BDA9C57436441BCE45651ACE7B815B" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationCalculationRollForward_E38905D8548C20D640D0651ACE7BDE6D" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss_52BDA9C57436441BCE45651ACE7B815B" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.dxpe.com/role/FairValueOfFinancialAssetsAndLiabilitiesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/IncomeTaxes" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/IncomeTaxesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/Inventories" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/InventoriesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/InventoriesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/Leases" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/LeasesContractualObligationsRelatedToOperatingLeasesUnderAsc840Details" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/LeasesLeaseExpenseDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/LeasesLeaseTermAndDiscountRateDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/LeasesMaturityOfLeaseLiabilitiesDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/LeasesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeLeaseDescriptionLineItems" xlink:label="loc_us-gaap_LesseeLeaseDescriptionLineItems_F430831F9FD9551E8102B25A8976B245" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LesseeLeaseDescriptionTable" xlink:label="loc_us-gaap_LesseeLeaseDescriptionTable_D67A667182ED55FBB017C9E66C7C93CF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_F430831F9FD9551E8102B25A8976B245" xlink:to="loc_us-gaap_LesseeLeaseDescriptionTable_D67A667182ED55FBB017C9E66C7C93CF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeAxis" xlink:label="loc_srt_RangeAxis_440F047A7F6851E8A0F28498E757A34F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_D67A667182ED55FBB017C9E66C7C93CF" xlink:to="loc_srt_RangeAxis_440F047A7F6851E8A0F28498E757A34F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_E0EBFAA37C231DEE35CC8000CE971D3F_7BAF009F6BDD5CE088A333C77FB7FDC5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_440F047A7F6851E8A0F28498E757A34F" xlink:to="loc_srt_RangeMember_E0EBFAA37C231DEE35CC8000CE971D3F_7BAF009F6BDD5CE088A333C77FB7FDC5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_RangeMember" xlink:label="loc_srt_RangeMember_E9A3D550597F5F6CB0588F61673EC953" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_440F047A7F6851E8A0F28498E757A34F" xlink:to="loc_srt_RangeMember_E9A3D550597F5F6CB0588F61673EC953" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MinimumMember" xlink:label="loc_srt_MinimumMember_38335D96A2B858118C1F784687A25849" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_E9A3D550597F5F6CB0588F61673EC953" xlink:to="loc_srt_MinimumMember_38335D96A2B858118C1F784687A25849" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_MaximumMember" xlink:label="loc_srt_MaximumMember_4A65804D6FBD596197D9E696097689C6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_E9A3D550597F5F6CB0588F61673EC953" xlink:to="loc_srt_MaximumMember_4A65804D6FBD596197D9E696097689C6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_86BFF27D3736517C9F7395B9B05C0B2A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_D67A667182ED55FBB017C9E66C7C93CF" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_86BFF27D3736517C9F7395B9B05C0B2A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_D384852453CA684508FD8000CE976AE0_7BAF009F6BDD5CE088A333C77FB7FDC5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_86BFF27D3736517C9F7395B9B05C0B2A" xlink:to="loc_us-gaap_TypeOfAdoptionMember_D384852453CA684508FD8000CE976AE0_7BAF009F6BDD5CE088A333C77FB7FDC5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_1E92F54DB3F55E839124223A15085B4E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_86BFF27D3736517C9F7395B9B05C0B2A" xlink:to="loc_us-gaap_TypeOfAdoptionMember_1E92F54DB3F55E839124223A15085B4E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AccountingStandardsUpdate201602Member" xlink:label="loc_us-gaap_AccountingStandardsUpdate201602Member_F54C11F74FB251998DA9701EEB287136" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_1E92F54DB3F55E839124223A15085B4E" xlink:to="loc_us-gaap_AccountingStandardsUpdate201602Member_F54C11F74FB251998DA9701EEB287136" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_40EE05E38B5E5819864B21CAE4E669FA" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LesseeLeaseDescriptionTable_D67A667182ED55FBB017C9E66C7C93CF" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_40EE05E38B5E5819864B21CAE4E669FA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_5D34E7BD2A2A3D102B228000CE985036_7BAF009F6BDD5CE088A333C77FB7FDC5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_40EE05E38B5E5819864B21CAE4E669FA" xlink:to="loc_us-gaap_RelatedPartyDomain_5D34E7BD2A2A3D102B228000CE985036_7BAF009F6BDD5CE088A333C77FB7FDC5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RelatedPartyDomain" xlink:label="loc_us-gaap_RelatedPartyDomain_C7B50D2B81D15E15AD51B3AAFCF44454" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_40EE05E38B5E5819864B21CAE4E669FA" xlink:to="loc_us-gaap_RelatedPartyDomain_C7B50D2B81D15E15AD51B3AAFCF44454" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ChiefExecutiveOfficerMember" xlink:label="loc_us-gaap_ChiefExecutiveOfficerMember_5EA58EA48E825C7EBF5D45271377057C" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_C7B50D2B81D15E15AD51B3AAFCF44454" xlink:to="loc_us-gaap_ChiefExecutiveOfficerMember_5EA58EA48E825C7EBF5D45271377057C" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_LesseeClassesofLeasedAssetsNumber" xlink:label="loc_dxpe_LesseeClassesofLeasedAssetsNumber_EC7696FCDC7853B9A195CCBA716533F7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_F430831F9FD9551E8102B25A8976B245" xlink:to="loc_dxpe_LesseeClassesofLeasedAssetsNumber_EC7696FCDC7853B9A195CCBA716533F7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_9181C4EC892A5D68B8ADF57727D08E9A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_F430831F9FD9551E8102B25A8976B245" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_9181C4EC892A5D68B8ADF57727D08E9A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_04EAA767C52A5637A2735495E7183EC5" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_F430831F9FD9551E8102B25A8976B245" xlink:to="loc_us-gaap_OperatingLeaseLiability_04EAA767C52A5637A2735495E7183EC5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_2D5ADB06C8C859D780AC018FEDA16C02" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_F430831F9FD9551E8102B25A8976B245" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_2D5ADB06C8C859D780AC018FEDA16C02" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_LesseeLeaseRenewalTerm" xlink:label="loc_dxpe_LesseeLeaseRenewalTerm_5003ECD7D61955BDAACFFA7CB0CFD0A3" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_F430831F9FD9551E8102B25A8976B245" xlink:to="loc_dxpe_LesseeLeaseRenewalTerm_5003ECD7D61955BDAACFFA7CB0CFD0A3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseExpense" xlink:label="loc_us-gaap_OperatingLeaseExpense_B0D2DB05CC1B5D23910F5DE308FA6F1F" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LesseeLeaseDescriptionLineItems_F430831F9FD9551E8102B25A8976B245" xlink:to="loc_us-gaap_OperatingLeaseExpense_B0D2DB05CC1B5D23910F5DE308FA6F1F" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.dxpe.com/role/LeasesSupplementalBalanceSheetInformationDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_CFB6AE79EFA361FF1B664ED7174AD108" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_1ED862977C8025A7F1B54ED71747C691" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_CFB6AE79EFA361FF1B664ED7174AD108" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_1ED862977C8025A7F1B54ED71747C691" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_2642F5A7E04BC9D30B574ED717488CA7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_1ED862977C8025A7F1B54ED71747C691" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_2642F5A7E04BC9D30B574ED717488CA7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_5F39C4C927E5EB4DE4084ED717483A95_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_2642F5A7E04BC9D30B574ED717488CA7" xlink:to="loc_us-gaap_TypeOfAdoptionMember_5F39C4C927E5EB4DE4084ED717483A95_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TypeOfAdoptionMember" xlink:label="loc_us-gaap_TypeOfAdoptionMember_5F39C4C927E5EB4DE4084ED717483A95" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_2642F5A7E04BC9D30B574ED717488CA7" xlink:to="loc_us-gaap_TypeOfAdoptionMember_5F39C4C927E5EB4DE4084ED717483A95" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_OperatingLeaseRightofUseAssetRollForward" xlink:label="loc_dxpe_OperatingLeaseRightofUseAssetRollForward_5E01B68D5CFE6B054CB94ED7174B45F9" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_CFB6AE79EFA361FF1B664ED7174AD108" xlink:to="loc_dxpe_OperatingLeaseRightofUseAssetRollForward_5E01B68D5CFE6B054CB94ED7174B45F9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_F0EDAFE50DE4D0CE54054ED7174BB5AD" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dxpe_OperatingLeaseRightofUseAssetRollForward_5E01B68D5CFE6B054CB94ED7174B45F9" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_F0EDAFE50DE4D0CE54054ED7174BB5AD" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_OperatingLeaseLiabilitiesRollForward" xlink:label="loc_dxpe_OperatingLeaseLiabilitiesRollForward_F4210E95FC21DBAE05414ED7174BBFEA" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_CFB6AE79EFA361FF1B664ED7174AD108" xlink:to="loc_dxpe_OperatingLeaseLiabilitiesRollForward_F4210E95FC21DBAE05414ED7174BBFEA" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_33B37F0C86CD756C06574ED7174B9490" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dxpe_OperatingLeaseLiabilitiesRollForward_F4210E95FC21DBAE05414ED7174BBFEA" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_33B37F0C86CD756C06574ED7174B9490" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_93CDE15364F3E68CEA2F4ED7174CE06A" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dxpe_OperatingLeaseLiabilitiesRollForward_F4210E95FC21DBAE05414ED7174BBFEA" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_93CDE15364F3E68CEA2F4ED7174CE06A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingLeaseLiability" xlink:label="loc_us-gaap_OperatingLeaseLiability_CE06FC67EF9EF2A8290D4ED7174C735F" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dxpe_OperatingLeaseLiabilitiesRollForward_F4210E95FC21DBAE05414ED7174BBFEA" xlink:to="loc_us-gaap_OperatingLeaseLiability_CE06FC67EF9EF2A8290D4ED7174C735F" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.dxpe.com/role/LeasesSupplementalCashFlowInformationDetails" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/LeasesTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/LongTermDebt" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/LongTermDebtDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_41A3093A536F4B501D9731F0D140089E" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LineOfCreditFacilityTable" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_25F34024BE354BC648F431F0D140CD86" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_41A3093A536F4B501D9731F0D140089E" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_25F34024BE354BC648F431F0D140CD86" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueByMeasurementBasisAxis" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_0004F1CE676791A5C05E31F0D1402FFE" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_25F34024BE354BC648F431F0D140CD86" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_0004F1CE676791A5C05E31F0D1402FFE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_9793C4C5FD74226D042831F0D140F16B_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_0004F1CE676791A5C05E31F0D1402FFE" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_9793C4C5FD74226D042831F0D140F16B_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FairValueDisclosureItemAmountsDomain" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_74301430BA4EE27559F131F0D14032C2" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_0004F1CE676791A5C05E31F0D1402FFE" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_74301430BA4EE27559F131F0D14032C2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_9793C4C5FD74226D042831F0D140F16B" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_74301430BA4EE27559F131F0D14032C2" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_9793C4C5FD74226D042831F0D140F16B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_ED23F069C1485C1C795331F0D140E752" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_74301430BA4EE27559F131F0D14032C2" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_ED23F069C1485C1C795331F0D140E752" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_87F2205B3BC08246DF3D31F0D1400C64" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_74301430BA4EE27559F131F0D14032C2" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_87F2205B3BC08246DF3D31F0D1400C64" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentAxis" xlink:label="loc_us-gaap_DebtInstrumentAxis_8FFFCA9F326813E96AE531F0D140BD12" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_25F34024BE354BC648F431F0D140CD86" xlink:to="loc_us-gaap_DebtInstrumentAxis_8FFFCA9F326813E96AE531F0D140BD12" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_E3F41FFCEF0D4B8A387331F0D140A2CC_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_8FFFCA9F326813E96AE531F0D140BD12" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_E3F41FFCEF0D4B8A387331F0D140A2CC_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentNameDomain" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_E3F41FFCEF0D4B8A387331F0D140A2CC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_8FFFCA9F326813E96AE531F0D140BD12" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_E3F41FFCEF0D4B8A387331F0D140A2CC" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_ABLRevolverMember" xlink:label="loc_dxpe_ABLRevolverMember_EC174C5687957540B95F31F0D140632E" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_E3F41FFCEF0D4B8A387331F0D140A2CC" xlink:to="loc_dxpe_ABLRevolverMember_EC174C5687957540B95F31F0D140632E" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_TermLoanBMember" xlink:label="loc_dxpe_TermLoanBMember_136D4A14A8862A5E8A7431F0D140918B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_E3F41FFCEF0D4B8A387331F0D140A2CC" xlink:to="loc_dxpe_TermLoanBMember_136D4A14A8862A5E8A7431F0D140918B" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_PromissoryNoteDueJanuary2021Member" xlink:label="loc_dxpe_PromissoryNoteDueJanuary2021Member_25D1D49FED4B20736B5931F0D1408E42" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_E3F41FFCEF0D4B8A387331F0D140A2CC" xlink:to="loc_dxpe_PromissoryNoteDueJanuary2021Member_25D1D49FED4B20736B5931F0D1408E42" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract" xlink:label="loc_us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract_63F1A6BFB6B1CCDC337D31F0D1403F17" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_41A3093A536F4B501D9731F0D140089E" xlink:to="loc_us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract_63F1A6BFB6B1CCDC337D31F0D1403F17" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebt" xlink:label="loc_us-gaap_LongTermDebt_9A64BCA0235516BE9A6B31F0D1401EB5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract_63F1A6BFB6B1CCDC337D31F0D1403F17" xlink:to="loc_us-gaap_LongTermDebt_9A64BCA0235516BE9A6B31F0D1401EB5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtCurrent" xlink:label="loc_us-gaap_LongTermDebtCurrent_E5F2B4AB5F36AB59363B31F0D140C001" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract_63F1A6BFB6B1CCDC337D31F0D1403F17" xlink:to="loc_us-gaap_LongTermDebtCurrent_E5F2B4AB5F36AB59363B31F0D140C001" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_LongTermDebtNoncurrent" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_E50A81EB8AFA694EF06931F0D14060F2" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongTermDebtByCurrentAndNoncurrentAbstract_63F1A6BFB6B1CCDC337D31F0D1403F17" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_E50A81EB8AFA694EF06931F0D14060F2" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet_8ABC2C21E1304E24CA6231F0D140C14F" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_41A3093A536F4B501D9731F0D140089E" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet_8ABC2C21E1304E24CA6231F0D140C14F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_EB08BA3AF6DBA7218A5B31F0D140DA87" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_41A3093A536F4B501D9731F0D140089E" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_EB08BA3AF6DBA7218A5B31F0D140DA87" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.dxpe.com/role/LongTermDebtTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/RecentAccountingPronouncements" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/RecentAccountingPronouncementsPolicies" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/SegmentReporting" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/SegmentReportingFinancialInformationOfCompanysSegmentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_7C21F1971F2539960F3831F0D106A9D5" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_402A284959CF444E08B331F0D1067A90" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7C21F1971F2539960F3831F0D106A9D5" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_402A284959CF444E08B331F0D1067A90" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_17AF84673A4227D0095531F0D10634C4" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_402A284959CF444E08B331F0D1067A90" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_17AF84673A4227D0095531F0D10634C4" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_4201F5450290F6C257F831F0D1063E87_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_17AF84673A4227D0095531F0D10634C4" xlink:to="loc_us-gaap_SegmentDomain_4201F5450290F6C257F831F0D1063E87_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_4201F5450290F6C257F831F0D1063E87" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_17AF84673A4227D0095531F0D10634C4" xlink:to="loc_us-gaap_SegmentDomain_4201F5450290F6C257F831F0D1063E87" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_ServiceCentersMember" xlink:label="loc_dxpe_ServiceCentersMember_D8F542733A6995C5104431F0D1065DBF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_4201F5450290F6C257F831F0D1063E87" xlink:to="loc_dxpe_ServiceCentersMember_D8F542733A6995C5104431F0D1065DBF" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_InnovativePumpingSolutionsMember" xlink:label="loc_dxpe_InnovativePumpingSolutionsMember_149ECAC23F51D00BE9C631F0D1069012" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_4201F5450290F6C257F831F0D1063E87" xlink:to="loc_dxpe_InnovativePumpingSolutionsMember_149ECAC23F51D00BE9C631F0D1069012" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_SupplyChainServicesMember" xlink:label="loc_dxpe_SupplyChainServicesMember_2CC67C69285BD7FB7FDA31F0D106D68C" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_4201F5450290F6C257F831F0D1063E87" xlink:to="loc_dxpe_SupplyChainServicesMember_2CC67C69285BD7FB7FDA31F0D106D68C" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_B8BE6190D1578C6D4D1531F0D10641DE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_402A284959CF444E08B331F0D1067A90" xlink:to="loc_srt_ProductOrServiceAxis_B8BE6190D1578C6D4D1531F0D10641DE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_DD0780D7FEE439C18F2231F0D106A75A_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_B8BE6190D1578C6D4D1531F0D10641DE" xlink:to="loc_srt_ProductsAndServicesDomain_DD0780D7FEE439C18F2231F0D106A75A_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ProductsAndServicesDomain" xlink:label="loc_srt_ProductsAndServicesDomain_DD0780D7FEE439C18F2231F0D106A75A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_B8BE6190D1578C6D4D1531F0D10641DE" xlink:to="loc_srt_ProductsAndServicesDomain_DD0780D7FEE439C18F2231F0D106A75A" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ProductMember" xlink:label="loc_us-gaap_ProductMember_49E7142BDB2E3DEEE35831F0D106AD4F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_DD0780D7FEE439C18F2231F0D106A75A" xlink:to="loc_us-gaap_ProductMember_49E7142BDB2E3DEEE35831F0D106AD4F" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_InventoryManagementServiceMember" xlink:label="loc_dxpe_InventoryManagementServiceMember_E8458A2DA2A802DE9FF531F0D1065B15" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_DD0780D7FEE439C18F2231F0D106A75A" xlink:to="loc_dxpe_InventoryManagementServiceMember_E8458A2DA2A802DE9FF531F0D1065B15" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_StaffingServicesMember" xlink:label="loc_dxpe_StaffingServicesMember_C369EC29A8E90931E7F431F0D1067AB6" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_DD0780D7FEE439C18F2231F0D106A75A" xlink:to="loc_dxpe_StaffingServicesMember_C369EC29A8E90931E7F431F0D1067AB6" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_CustomizedPumpProductionMember" xlink:label="loc_dxpe_CustomizedPumpProductionMember_3428CF867EABA9C1ACD131F0D1063587" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_DD0780D7FEE439C18F2231F0D106A75A" xlink:to="loc_dxpe_CustomizedPumpProductionMember_3428CF867EABA9C1ACD131F0D1063587" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerBasisOfPricingAxis" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_A2BA61CAF4D8792B7F8C31F0D1067EBE" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_402A284959CF444E08B331F0D1067A90" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_A2BA61CAF4D8792B7F8C31F0D1067EBE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_224EA1B0274A6CE662B831F0D106E939_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_A2BA61CAF4D8792B7F8C31F0D1067EBE" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_224EA1B0274A6CE662B831F0D106E939_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ContractWithCustomerBasisOfPricingDomain" xlink:label="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_224EA1B0274A6CE662B831F0D106E939" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingAxis_A2BA61CAF4D8792B7F8C31F0D1067EBE" xlink:to="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_224EA1B0274A6CE662B831F0D106E939" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_FixedPriceContractMember" xlink:label="loc_us-gaap_FixedPriceContractMember_592BB62351194616A94F31F0D106B189" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_224EA1B0274A6CE662B831F0D106E939" xlink:to="loc_us-gaap_FixedPriceContractMember_592BB62351194616A94F31F0D106B189" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TimeAndMaterialsContractMember" xlink:label="loc_us-gaap_TimeAndMaterialsContractMember_98DEFB14773E73A98C7E31F0D1063075" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ContractWithCustomerBasisOfPricingDomain_224EA1B0274A6CE662B831F0D106E939" xlink:to="loc_us-gaap_TimeAndMaterialsContractMember_98DEFB14773E73A98C7E31F0D1063075" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TimingOfTransferOfGoodOrServiceAxis" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_A6F0C8BB779D9152191631F0D1062763" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_402A284959CF444E08B331F0D1067A90" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_A6F0C8BB779D9152191631F0D1062763" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_21AA5CD45BE322E64F8631F0D106A2C7_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_A6F0C8BB779D9152191631F0D1062763" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_21AA5CD45BE322E64F8631F0D106A2C7_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TimingOfTransferOfGoodOrServiceDomain" xlink:label="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_21AA5CD45BE322E64F8631F0D106A2C7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceAxis_A6F0C8BB779D9152191631F0D1062763" xlink:to="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_21AA5CD45BE322E64F8631F0D106A2C7" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TransferredAtPointInTimeMember" xlink:label="loc_us-gaap_TransferredAtPointInTimeMember_EE8010A7DF6965EA9F8931F0D1064BC5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_21AA5CD45BE322E64F8631F0D106A2C7" xlink:to="loc_us-gaap_TransferredAtPointInTimeMember_EE8010A7DF6965EA9F8931F0D1064BC5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_TransferredOverTimeMember" xlink:label="loc_us-gaap_TransferredOverTimeMember_14E8E1996670749422E631F0D106C8A6" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TimingOfTransferOfGoodOrServiceDomain_21AA5CD45BE322E64F8631F0D106A2C7" xlink:to="loc_us-gaap_TransferredOverTimeMember_14E8E1996670749422E631F0D106C8A6" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentReportingInformationProfitLossAbstract" xlink:label="loc_us-gaap_SegmentReportingInformationProfitLossAbstract_1B0578723CAC7B0B79AE31F0D106EF29" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_7C21F1971F2539960F3831F0D106A9D5" xlink:to="loc_us-gaap_SegmentReportingInformationProfitLossAbstract_1B0578723CAC7B0B79AE31F0D106EF29" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_77C755B1EE726D92D60C31F0D106DE0A" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationProfitLossAbstract_1B0578723CAC7B0B79AE31F0D106EF29" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_77C755B1EE726D92D60C31F0D106DE0A" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_OperatingIncomeExcludingAmortization" xlink:label="loc_dxpe_OperatingIncomeExcludingAmortization_20BBBBDD0ADBD93DD2D831F0D106E306" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationProfitLossAbstract_1B0578723CAC7B0B79AE31F0D106EF29" xlink:to="loc_dxpe_OperatingIncomeExcludingAmortization_20BBBBDD0ADBD93DD2D831F0D106E306" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.dxpe.com/role/SegmentReportingIdentifiableAssetsBySegmentsDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_13CE367311B75B5BB6E13C148EA0DDBD" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_5C3AFB11D56B5845A31799F0C7A98BEF" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_13CE367311B75B5BB6E13C148EA0DDBD" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_5C3AFB11D56B5845A31799F0C7A98BEF" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_98B707A8EEDF56F39A847C019DC682F3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_5C3AFB11D56B5845A31799F0C7A98BEF" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_98B707A8EEDF56F39A847C019DC682F3" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_4EA0F16EC2BF7101B41F8000CD021F29_7BAF009F6BDD5CE088A333C77FB7FDC5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_98B707A8EEDF56F39A847C019DC682F3" xlink:to="loc_us-gaap_SegmentDomain_4EA0F16EC2BF7101B41F8000CD021F29_7BAF009F6BDD5CE088A333C77FB7FDC5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentDomain" xlink:label="loc_us-gaap_SegmentDomain_F6D5CB321F7653B3B656ABF2A4B456F0" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_98B707A8EEDF56F39A847C019DC682F3" xlink:to="loc_us-gaap_SegmentDomain_F6D5CB321F7653B3B656ABF2A4B456F0" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_ServiceCentersMember" xlink:label="loc_dxpe_ServiceCentersMember_CC116BA0EBF650E980989D846AB8A0A8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_F6D5CB321F7653B3B656ABF2A4B456F0" xlink:to="loc_dxpe_ServiceCentersMember_CC116BA0EBF650E980989D846AB8A0A8" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_InnovativePumpingSolutionsMember" xlink:label="loc_dxpe_InnovativePumpingSolutionsMember_4012A7F499075E21A9AD543FD08818D3" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_F6D5CB321F7653B3B656ABF2A4B456F0" xlink:to="loc_dxpe_InnovativePumpingSolutionsMember_4012A7F499075E21A9AD543FD08818D3" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_SupplyChainServicesMember" xlink:label="loc_dxpe_SupplyChainServicesMember_4EA739608FF35D7E8F5A7F1FD36FE2FD" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_F6D5CB321F7653B3B656ABF2A4B456F0" xlink:to="loc_dxpe_SupplyChainServicesMember_4EA739608FF35D7E8F5A7F1FD36FE2FD" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_A1912EFB8FD151BCBCBD832355F78ACC" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_5C3AFB11D56B5845A31799F0C7A98BEF" xlink:to="loc_srt_ConsolidationItemsAxis_A1912EFB8FD151BCBCBD832355F78ACC" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_2D6B932148E0B58CEB4B8000CD035693_7BAF009F6BDD5CE088A333C77FB7FDC5" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_A1912EFB8FD151BCBCBD832355F78ACC" xlink:to="loc_srt_ConsolidationItemsDomain_2D6B932148E0B58CEB4B8000CD035693_7BAF009F6BDD5CE088A333C77FB7FDC5" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_4E13B4374B0B595884C36CA2FEF95D3D" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_A1912EFB8FD151BCBCBD832355F78ACC" xlink:to="loc_srt_ConsolidationItemsDomain_4E13B4374B0B595884C36CA2FEF95D3D" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CorporateNonSegmentMember" xlink:label="loc_us-gaap_CorporateNonSegmentMember_355AAF2605B95C37AC72160DF7B16FF7" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_4E13B4374B0B595884C36CA2FEF95D3D" xlink:to="loc_us-gaap_CorporateNonSegmentMember_355AAF2605B95C37AC72160DF7B16FF7" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_IndentifiableAssets" xlink:label="loc_dxpe_IndentifiableAssets_EE6C3650E5265EA9B361ED57D2B44DD8" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_13CE367311B75B5BB6E13C148EA0DDBD" xlink:to="loc_dxpe_IndentifiableAssets_EE6C3650E5265EA9B361ED57D2B44DD8" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.dxpe.com/role/SegmentReportingReconciliationOfOperatingIncomeToConsolidatedIncomeDetails" xlink:type="extended">
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentReportingInformationLineItems" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_C48B73DA2D4DB30303B3687F9A91C2DD" xlink:type="locator" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_91495E4DE8FB42946672687F9A916BBC" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_C48B73DA2D4DB30303B3687F9A91C2DD" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_91495E4DE8FB42946672687F9A916BBC" xlink:type="arc" xbrldt:closed="true" xbrldt:contextElement="segment" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationItemsAxis" xlink:label="loc_srt_ConsolidationItemsAxis_96398D1ECBA27CDDE80F687F9A91C916" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_91495E4DE8FB42946672687F9A916BBC" xlink:to="loc_srt_ConsolidationItemsAxis_96398D1ECBA27CDDE80F687F9A91C916" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_0FF2E9B24A0EE0ED0230687F9A91E515_default" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_96398D1ECBA27CDDE80F687F9A91C916" xlink:to="loc_srt_ConsolidationItemsDomain_0FF2E9B24A0EE0ED0230687F9A91E515_default" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2018/elts/srt-2018-01-31.xsd#srt_ConsolidationItemsDomain" xlink:label="loc_srt_ConsolidationItemsDomain_0FF2E9B24A0EE0ED0230687F9A91E515" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_96398D1ECBA27CDDE80F687F9A91C916" xlink:to="loc_srt_ConsolidationItemsDomain_0FF2E9B24A0EE0ED0230687F9A91E515" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingSegmentsMember" xlink:label="loc_us-gaap_OperatingSegmentsMember_03EE04E5DC9FE75535BA687F9A912B8F" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_0FF2E9B24A0EE0ED0230687F9A91E515" xlink:to="loc_us-gaap_OperatingSegmentsMember_03EE04E5DC9FE75535BA687F9A912B8F" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_MaterialReconcilingItemsMember" xlink:label="loc_us-gaap_MaterialReconcilingItemsMember_43065FB74468A70FEE73687F9A910CAE" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_0FF2E9B24A0EE0ED0230687F9A91E515" xlink:to="loc_us-gaap_MaterialReconcilingItemsMember_43065FB74468A70FEE73687F9A910CAE" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_CorporateNonSegmentMember" xlink:label="loc_us-gaap_CorporateNonSegmentMember_23169C866B066763FAA3687F9A91BD07" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_0FF2E9B24A0EE0ED0230687F9A91E515" xlink:to="loc_us-gaap_CorporateNonSegmentMember_23169C866B066763FAA3687F9A91BD07" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_SegmentReportingInformationOperatingIncomeLossAbstract" xlink:label="loc_us-gaap_SegmentReportingInformationOperatingIncomeLossAbstract_9367385B1DA8576E9FA5687F9A917AB3" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_C48B73DA2D4DB30303B3687F9A91C2DD" xlink:to="loc_us-gaap_SegmentReportingInformationOperatingIncomeLossAbstract_9367385B1DA8576E9FA5687F9A917AB3" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_OperatingIncomeForReportableSegments" xlink:label="loc_dxpe_OperatingIncomeForReportableSegments_B0807860F983540E18F1687F9A913912" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationOperatingIncomeLossAbstract_9367385B1DA8576E9FA5687F9A917AB3" xlink:to="loc_dxpe_OperatingIncomeForReportableSegments_B0807860F983540E18F1687F9A913912" xlink:type="arc" />
    <link:loc xlink:href="dxpe-20190630.xsd#dxpe_AdjustmentForAbstract" xlink:label="loc_dxpe_AdjustmentForAbstract_4A0729C9FBFB6DD5C35A687F9A91B6F9" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationOperatingIncomeLossAbstract_9367385B1DA8576E9FA5687F9A917AB3" xlink:to="loc_dxpe_AdjustmentForAbstract_4A0729C9FBFB6DD5C35A687F9A91B6F9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_AmortizationOfIntangibleAssets" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_93E8B0D372A2C0DC58FD687F9A918C45" xlink:type="locator" />
    <link:definitionArc order="1" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dxpe_AdjustmentForAbstract_4A0729C9FBFB6DD5C35A687F9A91B6F9" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_93E8B0D372A2C0DC58FD687F9A918C45" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_GeneralAndAdministrativeExpense" xlink:label="loc_us-gaap_GeneralAndAdministrativeExpense_28CF2D729D787E986F4F687F9A91123B" xlink:type="locator" />
    <link:definitionArc order="2" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dxpe_AdjustmentForAbstract_4A0729C9FBFB6DD5C35A687F9A91B6F9" xlink:to="loc_us-gaap_GeneralAndAdministrativeExpense_28CF2D729D787E986F4F687F9A91123B" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_OperatingIncomeLoss" xlink:label="loc_us-gaap_OperatingIncomeLoss_D1D8CCFD84160ED4D108687F9A9109D9" xlink:type="locator" />
    <link:definitionArc order="3" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationOperatingIncomeLossAbstract_9367385B1DA8576E9FA5687F9A917AB3" xlink:to="loc_us-gaap_OperatingIncomeLoss_D1D8CCFD84160ED4D108687F9A9109D9" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_InterestExpense" xlink:label="loc_us-gaap_InterestExpense_B090446DF844F8D3E617687F9A91AC2E" xlink:type="locator" />
    <link:definitionArc order="4" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationOperatingIncomeLossAbstract_9367385B1DA8576E9FA5687F9A917AB3" xlink:to="loc_us-gaap_InterestExpense_B090446DF844F8D3E617687F9A91AC2E" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_NonoperatingIncomeExpense" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_23BCB7209A0079D4A5B3687F9A9144C1" xlink:type="locator" />
    <link:definitionArc order="5" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationOperatingIncomeLossAbstract_9367385B1DA8576E9FA5687F9A917AB3" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_23BCB7209A0079D4A5B3687F9A9144C1" xlink:type="arc" />
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2018/elts/us-gaap-2018-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_9048680341391AF8303D687F9A91B36D" xlink:type="locator" />
    <link:definitionArc order="6" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationOperatingIncomeLossAbstract_9367385B1DA8576E9FA5687F9A917AB3" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_9048680341391AF8303D687F9A91B36D" xlink:type="arc" />
  </link:definitionLink>
  <link:definitionLink xlink:role="http://www.dxpe.com/role/SegmentReportingTables" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/SubsequentEvents" xlink:type="extended" />
  <link:definitionLink xlink:role="http://www.dxpe.com/role/SummaryOfSignificantAccountingAndBusinessPolicies" xlink:type="extended" />
</link:linkbase>
