The inclination or necessity to marry within a particular group is called:

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Endogamy refers to the practice of marrying within a particular group, such as a specific race, culture, religion or social class. This can be based on personal preference or may be required by cultural or religious beliefs. Miscegenation refers to interracial marriage, while exogamy is the practice of marrying outside of one's own group. Propinquity refers to the tendency to form relationships with people who are geographically close.

The Inclination or Necessity to Marry Within a Particular Group