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in‧ter‧mar‧ry
past tense and past participle intermarried, present participle intermarrying, third person singular intermarries [intransitive]
past tense and past participle intermarried, present participle intermarrying, third person singular intermarries [intransitive]1SA if people from two social, racial, or religious groups intermarry, people from one group marry people from the other
2SSF to marry someone within your own group or family : 
It is not unusual for royal cousins to intermarry.
It is not unusual for royal cousins to intermarry.