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intr.v. 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.

[French fraterniser, from Medieval Latin frāternizāre, from Latin frāternus, fraternal; see fraternal.]

frat′er·ni·za′tion (-nĭ-zā′shən) n.
frat′er·niz′er n.
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References in periodicals archive ?
In certain sectors near Castuera (Badajoz) in the rich Serena Valley, fraternization was common and even "habitual."(36) What was unusual in this case was that the fraternizers were from supposedly elite forces.