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<!--Generated by DFIN XBRL Instance Document - http://www.dfinsolutions.com/ - Version R3.0 - on 29-April-2026 [04:42:46] {AM}-->
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        <link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/cef/role/RiskOnly" >
          <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/cef/2025/cef-2025.xsd#cef_AllRisksMember" xlink:label="loc_cef_AllRisksMember_200074" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_ClassFMember" xlink:label="loc_ck0001676197_ClassFMember_200626" />
          <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cef_AllRisksMember_200074" xlink:to="loc_ck0001676197_ClassFMember_200626" use="optional" order="14" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_ClassMMember" xlink:label="loc_ck0001676197_ClassMMember_200627" />
          <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cef_AllRisksMember_200074" xlink:to="loc_ck0001676197_ClassMMember_200627" use="optional" order="15" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_CommonSharesMember" xlink:label="loc_ck0001676197_CommonSharesMember_200629" />
          <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cef_AllRisksMember_200074" xlink:to="loc_ck0001676197_CommonSharesMember_200629" use="optional" order="16" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_LegalAndRegulatoryRisksMember" xlink:label="loc_ck0001676197_LegalAndRegulatoryRisksMember_200632" />
          <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cef_AllRisksMember_200074" xlink:to="loc_ck0001676197_LegalAndRegulatoryRisksMember_200632" use="optional" order="17" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_PossibleRiskOfConflictsMember" xlink:label="loc_ck0001676197_PossibleRiskOfConflictsMember_200633" />
          <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cef_AllRisksMember_200074" xlink:to="loc_ck0001676197_PossibleRiskOfConflictsMember_200633" use="optional" order="18" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_RedeemedSharesMember" xlink:label="loc_ck0001676197_RedeemedSharesMember_200628" />
          <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cef_AllRisksMember_200074" xlink:to="loc_ck0001676197_RedeemedSharesMember_200628" use="optional" order="19" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_RisksRelatedToAnInvestmentInTheFundMember" xlink:label="loc_ck0001676197_RisksRelatedToAnInvestmentInTheFundMember_200630" />
          <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cef_AllRisksMember_200074" xlink:to="loc_ck0001676197_RisksRelatedToAnInvestmentInTheFundMember_200630" use="optional" order="20" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_RisksRelatedToTheFundsInvestmentsMember" xlink:label="loc_ck0001676197_RisksRelatedToTheFundsInvestmentsMember_200631" />
          <link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_cef_AllRisksMember_200074" xlink:to="loc_ck0001676197_RisksRelatedToTheFundsInvestmentsMember_200631" use="optional" order="21" />
        </link:definitionLink>
        <link:labelLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link" >
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_ClassFMember" xlink:label="loc_ck0001676197_ClassFMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ck0001676197_ClassFMember" xml:lang="en-US">Class F [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001676197_ClassFMember" xlink:to="lab_ck0001676197_ClassFMember" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_ClassMMember" xlink:label="loc_ck0001676197_ClassMMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ck0001676197_ClassMMember" xml:lang="en-US">Class M [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001676197_ClassMMember" xlink:to="lab_ck0001676197_ClassMMember" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_CommonSharesMember" xlink:label="loc_ck0001676197_CommonSharesMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ck0001676197_CommonSharesMember" xml:lang="en-US">Common Shares [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001676197_CommonSharesMember" xlink:to="lab_ck0001676197_CommonSharesMember" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_LegalAndRegulatoryRisksMember" xlink:label="loc_ck0001676197_LegalAndRegulatoryRisksMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ck0001676197_LegalAndRegulatoryRisksMember" xml:lang="en-US">Legal and Regulatory Risks [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001676197_LegalAndRegulatoryRisksMember" xlink:to="lab_ck0001676197_LegalAndRegulatoryRisksMember" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_PossibleRiskOfConflictsMember" xlink:label="loc_ck0001676197_PossibleRiskOfConflictsMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ck0001676197_PossibleRiskOfConflictsMember" xml:lang="en-US">Possible Risk of Conflicts [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001676197_PossibleRiskOfConflictsMember" xlink:to="lab_ck0001676197_PossibleRiskOfConflictsMember" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_RedeemedSharesMember" xlink:label="loc_ck0001676197_RedeemedSharesMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ck0001676197_RedeemedSharesMember" xml:lang="en-US">Redeemed Shares [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001676197_RedeemedSharesMember" xlink:to="lab_ck0001676197_RedeemedSharesMember" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_RisksRelatedToAnInvestmentInTheFundMember" xlink:label="loc_ck0001676197_RisksRelatedToAnInvestmentInTheFundMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ck0001676197_RisksRelatedToAnInvestmentInTheFundMember" xml:lang="en-US">Risks Related to an Investment in the Fund [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001676197_RisksRelatedToAnInvestmentInTheFundMember" xlink:to="lab_ck0001676197_RisksRelatedToAnInvestmentInTheFundMember" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_RisksRelatedToTheFundsInvestmentsMember" xlink:label="loc_ck0001676197_RisksRelatedToTheFundsInvestmentsMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ck0001676197_RisksRelatedToTheFundsInvestmentsMember" xml:lang="en-US">Risks Related to the Funds Investments [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001676197_RisksRelatedToTheFundsInvestmentsMember" xlink:to="lab_ck0001676197_RisksRelatedToTheFundsInvestmentsMember" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_ClassAMember" xlink:label="loc_ck0001676197_ClassAMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ck0001676197_ClassAMember" xml:lang="en-US">Class A [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001676197_ClassAMember" xlink:to="lab_ck0001676197_ClassAMember" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_ClassASharesMember" xlink:label="loc_ck0001676197_ClassASharesMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ck0001676197_ClassASharesMember" xml:lang="en-US">Class A Shares [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001676197_ClassASharesMember" xlink:to="lab_ck0001676197_ClassASharesMember" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_ClassCMember" xlink:label="loc_ck0001676197_ClassCMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ck0001676197_ClassCMember" xml:lang="en-US">Class C [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001676197_ClassCMember" xlink:to="lab_ck0001676197_ClassCMember" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_ClassCSharesMember" xlink:label="loc_ck0001676197_ClassCSharesMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ck0001676197_ClassCSharesMember" xml:lang="en-US">Class C Shares [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001676197_ClassCSharesMember" xlink:to="lab_ck0001676197_ClassCSharesMember" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_ClassFSharesMember" xlink:label="loc_ck0001676197_ClassFSharesMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ck0001676197_ClassFSharesMember" xml:lang="en-US">Class F Shares [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001676197_ClassFSharesMember" xlink:to="lab_ck0001676197_ClassFSharesMember" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_ClassIMember" xlink:label="loc_ck0001676197_ClassIMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ck0001676197_ClassIMember" xml:lang="en-US">Class I [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001676197_ClassIMember" xlink:to="lab_ck0001676197_ClassIMember" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_ClassISharesMember" xlink:label="loc_ck0001676197_ClassISharesMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ck0001676197_ClassISharesMember" xml:lang="en-US">Class I Shares [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001676197_ClassISharesMember" xlink:to="lab_ck0001676197_ClassISharesMember" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_ClassLMember" xlink:label="loc_ck0001676197_ClassLMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ck0001676197_ClassLMember" xml:lang="en-US">Class L [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001676197_ClassLMember" xlink:to="lab_ck0001676197_ClassLMember" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_ClassLSharesMember" xlink:label="loc_ck0001676197_ClassLSharesMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ck0001676197_ClassLSharesMember" xml:lang="en-US">Class L Shares [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001676197_ClassLSharesMember" xlink:to="lab_ck0001676197_ClassLSharesMember" />
          <link:loc xlink:type="locator" xlink:href="ck0001676197-20260429.xsd#ck0001676197_ClassMSharesMember" xlink:label="loc_ck0001676197_ClassMSharesMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_ck0001676197_ClassMSharesMember" xml:lang="en-US">Class M Shares [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_ck0001676197_ClassMSharesMember" xlink:to="lab_ck0001676197_ClassMSharesMember" />
        </link:labelLink>
      </link:linkbase>
    </appinfo>
  </annotation>
  <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
  <import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <import namespace="http://xbrl.sec.gov/dei/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-2025.xsd" />
  <import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd" />
  <import namespace="http://xbrl.sec.gov/cef/2025" schemaLocation="https://xbrl.sec.gov/cef/2025/cef-2025.xsd" />
  <import namespace="http://xbrl.sec.gov/cef-pre/2025" schemaLocation="https://xbrl.sec.gov/cef/2025/cef-2025_pre.xsd" />
  <element name="CommonSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="ck0001676197_CommonSharesMember" substitutionGroup="xbrli:item" />
  <element name="ClassMMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="ck0001676197_ClassMMember" substitutionGroup="xbrli:item" />
  <element name="ClassFMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="ck0001676197_ClassFMember" substitutionGroup="xbrli:item" />
  <element name="ClassLMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="ck0001676197_ClassLMember" substitutionGroup="xbrli:item" />
  <element name="ClassIMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="ck0001676197_ClassIMember" substitutionGroup="xbrli:item" />
  <element name="ClassCMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="ck0001676197_ClassCMember" substitutionGroup="xbrli:item" />
  <element name="ClassAMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="ck0001676197_ClassAMember" substitutionGroup="xbrli:item" />
  <element name="RedeemedSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="ck0001676197_RedeemedSharesMember" substitutionGroup="xbrli:item" />
  <element name="RisksRelatedToTheFundsInvestmentsMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="ck0001676197_RisksRelatedToTheFundsInvestmentsMember" substitutionGroup="xbrli:item" />
  <element name="RisksRelatedToAnInvestmentInTheFundMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="ck0001676197_RisksRelatedToAnInvestmentInTheFundMember" substitutionGroup="xbrli:item" />
  <element name="PossibleRiskOfConflictsMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="ck0001676197_PossibleRiskOfConflictsMember" substitutionGroup="xbrli:item" />
  <element name="LegalAndRegulatoryRisksMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="ck0001676197_LegalAndRegulatoryRisksMember" substitutionGroup="xbrli:item" />
  <element name="ClassASharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="ck0001676197_ClassASharesMember" substitutionGroup="xbrli:item" />
  <element name="ClassMSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="ck0001676197_ClassMSharesMember" substitutionGroup="xbrli:item" />
  <element name="ClassCSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="ck0001676197_ClassCSharesMember" substitutionGroup="xbrli:item" />
  <element name="ClassFSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="ck0001676197_ClassFSharesMember" substitutionGroup="xbrli:item" />
  <element name="ClassLSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="ck0001676197_ClassLSharesMember" substitutionGroup="xbrli:item" />
  <element name="ClassISharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="ck0001676197_ClassISharesMember" substitutionGroup="xbrli:item" />
</schema>
