Source : Webster's Revised Unabridged Dictionary (1913)

Merger \Mer"ger\, n.
   1. One who, or that which, merges.

   2. (Law) An absorption of one estate, or one contract, in
      another, or of a minor offense in a greater.

Source : WordNet®

merger
     n 1: the combination of two or more commercial companies [syn: {amalgamation},
           {uniting}]
     2: an occurrence that involves the production of a union [syn:
        {fusion}, {unification}]