Definify.com

Webster 1913 Edition

Adj.

[

Endo-

+ Gr. [GREEK] marriage.]

Marrying within the same tribe; – opposed to

exogamous

endogamous ‎(not comparable)

(of a marriage) Within a social group. The practice of endogamy.
Many recent immigrants' marriages are endogamous.

of a marriage, within a social group