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Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   Satan
       n 1: (Judeo-Christian and Islamic religions) chief spirit of
            evil and adversary of God; tempter of mankind; master of
            Hell [syn: Satan, Old Nick, Devil, Lucifer,
            Beelzebub, the Tempter, Prince of Darkness]