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Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   Mafia
       n 1: a crime syndicate in the United States; organized in
            families; believed to have important relations to the
            Sicilian Mafia [syn: Mafia, Maffia, Cosa Nostra]
       2: a secret terrorist group in Sicily; originally opposed
          tyranny but evolved into a criminal organization in the
          middle of the 19th century [syn: Mafia, Maffia, Sicilian
    Mafia]
       3: any tightly knit group of trusted associates [syn: mafia,
          maffia]