sorority (n.)youdaoicibaDictYouDict[sorority 词源字典]
1530s, "a society of women, body of women united for some purpose," from Medieval Latin sororitas "sisterhood, of or pertaining to sisters," from Latin soror "sister" (see sister). Sense of "women's society in a college or university" attested by 1887 (Alpha Delta Pi claims founding in 1851).[sorority etymology, sorority origin, 英语词源]