in‧ter‧mar‧ry past tense and past participle intermarried, present participle intermarrying, third person singular intermarries [intransitive]
if people from two social, racial, or religious groups intermarry, people from one group marry people from the other
Over the centuries these Greeks intermarried with the natives.
to marry someone within your own group or family:
It is not unusual for royal cousins to intermarry.
—intermarriage noun [uncountable and countable]
intermarriage between ethnic groups