1. 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-Fatah;
WordNet (r) 3.0 (2006):
15 May Organization
n 1: 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-
Fatah