DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   ally
       n 1: a friendly nation
       2: an associate who provides cooperation or assistance; "he's a
          good ally in fight" [syn: ally, friend] [ant: enemy,
          foe]
       v 1: become an ally or associate, as by a treaty or marriage;
            "He allied himself with the Communists"