Source : Webster's Revised Unabridged Dictionary (1913)

Collision \Col*li"sion\, n. [L. collisio, fr. collidere. See
   {Collide}.]
   1. The act of striking together; a striking together, as of
      two hard bodies; a violent meeting, as of railroad trains;
      a clashing.

   2. A state of opposition; antagonism; interference.

            The collision of contrary false principles. --Bp.
                                                  Warburton.

            Sensitive to the most trifling collisions. --W.
                                                  Irving.

   Syn: Conflict; clashing; encounter; opposition.

Source : WordNet®

collision
     n 1: (physics) an brief event in which two or more bodies come
          together; "the collision of the particles resulted in an
          exchange of energy and a change of direction" [syn: {hit}]
     2: an accident resulting from violent impact of a moving
        object; "three passengers were killed in the collision";
        "the collision of the two ships resulted in a serious oil
        spill"
     3: a conflict of opposed ideas or attitudes or goals; "a
        collision of interests"

Source : Free On-Line Dictionary of Computing

collision
     
        1.  When two {hosts} transmit on a {network} at
        once causing their {packets} to collide and corrupt each
        other.
     
        See {collision detection}.
     
        2.  {hash collision}.
     
        (1995-01-06)