Source : Webster's Revised Unabridged Dictionary (1913)

Contusion \Con*tu"sion\, n. [L. contusio: cf. F. contusion.]
   1. The act or process of beating, bruising, or pounding; the
      state of being beaten or bruised.

   2. (Med.) A bruise; an injury attended with more or less
      disorganization of the subcutaneous tissue and effusion of
      blood beneath the skin, but without apparent wound.

Source : WordNet®

contusion
     n 1: an injury that doesn't break the skin but results in some
          discoloration [syn: {bruise}]
     2: the action of bruising; "the bruise resulted from a
        contusion"