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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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36) What was unusual in this case was that the fraternizers were from supposedly elite forces.