WordNet (r) 3.0 (2006):

Black September
    n 1: a Palestinian international terrorist organization that
         split from the PLO in 1974; has conducted terrorist attacks
         in 20 countries; "in the 1980s the Fatah-RC was considered
         the most dangerous and murderous Palestinian terror group"
         [syn: Fatah Revolutionary Council, Fatah-RC, Abu Nidal
         Organization, ANO, Arab Revolutionary Brigades, Black
         September, Revolutionary Organization of Socialist
         Muslims]