Webster's English Dictionary

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ally

1. al.ly \*-'li-, 'al-.i-\ vb [ME allien, fr. OF alier, fr. L alligare to 
   bind to, fr. a]d- + ligare to bind - more at LIGATURE 1: to unite or form a 
   connection between (as by marriage or by treaty) :  ASSOCIATE 2: to connect 
   or form a relation between (as by likeness or compatibility)  : to enter 
   into an alliance 
2. al.ly \'al-.i-, *-'li-\ n 1: a plant or animal linked to another by 
   genetic or evolutionary relations hip 2: a sovereign or state associated 
   with another by treaty or league  3: someone or something associated with 
   another as a helper : AUXILIAR Y