Definition of frat
US, informal
: fraternity sense 1c
Today's progressive notions of responsible partying and political correctness have hit hard at all eighteen of Dartmouth's frats but especially so at Alpha Delta, which has always had the reputation of being the baddest house on campus.— Eric Konigsberg
—often used before another noun frat houses/brothers(often disparaging) a frat boy [=a member of a fraternity]
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Merriam-Webster unabridged
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Time Traveler for frat
The first known use of frat was circa 1895
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