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Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   Aum
       n 1: a terrorist organization whose goal is to take over Japan
            and then the world; based on a religion founded in 1987
            that combines elements of Buddhism with Christianity; "in
            1995 Aum members released deadly sarin gas on a Tokyo
            subway train" [syn: Aum Shinrikyo, Aum, Supreme
    Truth]