unification
     n 1: an occurrence that involves the production of a union [syn:
          {fusion}, {merger}]
     2: the state of being joined or united or linked; "there is
        strength in union" [syn: {union}] [ant: {separation}]
     3: the act of making or becoming a single unit; "the union of
        opposing factions"; "he looked forward to the unification
        of his family for the holidays" [syn: {union}, {uniting},
        {conjugation}, {jointure}] [ant: {disunion}]
Source: WordNet® 2.0