Inflected forms: frat·er·nized, frat·er·niz·ing, frat·er·niz·es 1. To associate with others in a brotherly or congenial way. 2. To associate on friendly terms with an enemy or opposing group, often in violation of discipline or orders.
ETYMOLOGY:
French fraterniser, from Medieval Latin frternizre, from Latin frternus, fraternal. See fraternal.
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