The term sorority is commonly used to refer to many Greek letter societies for women, but not all were founded as sororities. ADPi was the first secret society for women, and also the first fraternity for women (it pays to have a best friend who is an ADPi, she tells me all these cool facts). Later, the term sorority was coined specifically for these groups and was used in charters after 1874 (give or take 8-10 years). I think that all Greek Letter sororities before that are actually "fraternities for women" and it probably uses that word in the original charters.
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