Etymology
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Words related to fraternity

*bhrater- 

bhrāter-, Proto-Indo-European root meaning "brother." 

It forms all or part of: br'er; brethren; ‌‌brother; bully (n.); confrere; fraternal; fraternity; fraternize; fratricide; friar; friary; pal.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit bhrátár-, Old Persian brata, Greek phratér, Latin frater, Old Irish brathir, Welsh brawd, Lithuanian broterėlis, Old Prussian brati, Old Church Slavonic bratru, Czech bratr, Polish brat, Russian bratŭ, Kurdish bera; Old English broþor, Old Norse broðir, German Bruder, Gothic bróþar

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frat (n.)
student slang shortening of fraternity, by 1888.
fraternal (adj.)
early 15c., from Old French fraternel "brotherly, fraternal," and directly from Medieval Latin fraternalis, from Latin fraternus "friendly, closely allied," literally "brotherly" (see fraternity). The noun meaning "fraternal twin" is recorded by 1911.
fraternize (v.)

1610s, "to sympathize as brothers," from French fraterniser, from Medieval Latin fraternizare, from Latin fraternus "brotherly" (see fraternity). Military sense of "cultivate friendship with enemy troops" is from 1897 (used in World War I with reference to the Christmas Truce). Used oddly in World War II armed forces jargon to mean "have sex with women from enemy countries" as a violation of military discipline.

A piece of frat, Wren-language for any attractive young woman — ex-enemy — in occupied territory. [John Irving, "Royal Navalese," 1946]

Related: Fraternized; fraternizing.