Source : Webster's Revised Unabridged Dictionary (1913)

Unite \U*nite"\, v. t. [imp. & p. p. {United}; p. pr. & vb. n.
   {Uniting}.] [L. unitus, p. p. of unire to unite, from unus
   one. See {One}.]
   1. To put together so as to make one; to join, as two or more
      constituents, to form a whole; to combine; to connect; to
      join; to cause to adhere; as, to unite bricks by mortar;
      to unite iron bars by welding; to unite two armies.

   2. Hence, to join by a legal or moral bond, as families by
      marriage, nations by treaty, men by opinions; to join in
      interest, affection, fellowship, or the like; to cause to
      agree; to harmonize; to associate; to attach.

            Under his great vicegerent reign abide, United as
            one individual soul.                  --Milton.

            The king proposed nothing more than to unite his
            kingdom in one form of worship.       --Clarendon.

   Syn: To add; join; annex; attach. See {Add}.

Source : WordNet®

uniting
     n 1: the combination of two or more commercial companies [syn: {amalgamation},
           {merger}]
     2: 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}, {unification},
         {conjugation}, {jointure}] [ant: {disunion}]