endogamous
adjective
of or relating to the practice of allowing marriage only within a specific tribe, caste, ethnic or religious group, or other social unit.
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Besides this exogamic marriage, an endogamic marriage was later recognized as conferring title, on the condition that the man reconciled the woman's blood relatives by the payment of a definite compensation.
From Women of the Teutonic Nations Woman: In all ages and in all countries Vol. 8 (of 10) by Hermann Schoenfeld