A group of girls or women associated for a common purpose; a sisterhood. / (US) A social organization of female students at a college or university; usually identified by Greek letters.

The custom of the marriage of a man to the sister of his wife, usually after the wife has died. / A marriage according to this custom.

In a sororal manner; sisterly.

plural of sororate

plural of sorority

(colloquial) A sorority sister; a fellow member of one's sorority.

Of or pertaining to a sister. / Related through someone's sister.

plural of soror

To associate, or hold fellowship, as sisters; to have sisterly feelings.

present participle of sororize