Within a social group. The practice of endogamy.(adjective)
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Use "endogamous" in a sentence
"To be precise, actual conspiracies tend to be found only among family members or, what amounts to the same thing, closely knit, endogamous ethnic groups."
"To be precise, actual conspiracies tend to be found only among family members or, what amounts to the same thing, closely knit endogamous ethnic groups."
"The Lubbe siblings remained in close contact and saw multiple endogamous marriages among their own children, but they chose diverse spouses for themselves."