• WordNet 3.6
    • v intermarry marry within the same ethnic, social, or family group
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Webster's Revised Unabridged Dictionary
    • v. i Intermarry To become connected by marriage between their members; to give and take mutually in marriage; -- said of families, ranks, races, castes, etc. "About the middle of the fourth century from the building of Rome, it was declared lawful for nobles and plebeians to intermarry ."
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Century Dictionary and Cyclopedia
    • intermarry To become connected by marriage, as two families, clans, classes, or tribes.
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Chambers's Twentieth Century Dictionary
    • v.i Intermarry in-tėr-mar′i to marry between or among: to marry reciprocally, or take one and give another in marriage
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In literature:

In England they are intermarrying, is it not so, with the aristocracy?
"The Traitors" by E. Phillips (Edward Phillips) Oppenheim
Their creed, as well as ours, forbade any intermarrying.
"Ireland as It Is" by Robert John Buckley (AKA R.J.B.)
Some of them, my child, have intermarried with Royalty itself.
"The Old Countess; or, The Two Proposals" by Ann S. Stephens
Wherever the prejudices of a caste compel its members to intermarry, certain special degenerations are produced.
"The Sexual Question" by August Forel
They worked for one another and intermarried.
"The Side Of The Angels" by Basil King
These families are mostly of moderate means, and often intermarry.
"'Jena' or 'Sedan'?" by Franz Beyerlein
Possibly no other nation is so willing to intermarry with alien races as the Portuguese.
"Rulers of India: Albuquerque" by Henry Morse Stephens
The Dalbergs, moreover, had intermarried with an Italian family, the Brignoli.
"The History of Freedom" by John Emerich Edward Dalberg-Acton
They intermarry with the English but little.
"The Ethnology of the British Colonies and Dependencies" by Robert Gordon Latham
Polygamy is not permitted, and the tribes intermarry with each other.
"Harper's New Monthly Magazine, Volume 1, No. 4, September, 1850" by Various

In news:

The various royal families were so intermarried that their family trees looked more like the rhizome root systems of a bamboo forest.
Intermarried Does Not Equal Anti-Zionist.
Don't write off the intermarried.