Yeah, it REALLY depends on how you want to frame the argument/discussion. There's no question that Phi Mu & ADPi have existed the longest, but they were formed as literary societies, not women's fraternities. Pi Phi was the first to be formed specifically as a women's fraternity. Theta & Kappa were the first to use the Greek letters, Gamma Phi (I think?) was the first to use the term "sorority."
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