Source : Webster's Revised Unabridged Dictionary (1913)

Intermarry \In`ter*mar"ry\, v. i.
   To become connected by marriage between their members; to
   give and take mutually in marriage; -- said of families,
   ranks, castes, etc.

         About the middle of the fourth century from the
         building of Rome, it was declared lawful for nobles and
         plebeians to intermarry.                 --Swift.

Source : WordNet®

intermarry
     v : marry within the same ethnic, social, or family group
     [also: {intermarried}]