/ Thesaurus / 1 Synonyms of 15 may organization Find synonyms for: Noun1. 15 May Organizationusage: a terrorist organization formed in 1979 by a faction of the Popular Front for the Liberation of Palestine but disbanded in the 1980s when key members left to join a faction of al-FatahWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: nefarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language