Source : Webster's Revised Unabridged Dictionary (1913)

Incision \In*ci"sion\, n. [L. incisio: cf. F. incision. See
   {Incise}.]
   1. The act of incising, or cutting into a substance.
      --Milton.

   2. That which is produced by incising; the separation of the
      parts of any substance made by a cutting or pointed
      instrument; a cut; a gash.

   3. Separation or solution of viscid matter by medicines.
      [Obs.]

Source : WordNet®

incision
     n 1: a depression scratched or carved into a surface [syn: {scratch},
           {prick}, {slit}, {dent}]
     2: the cutting of or into body tissues or organs (especially by
        a surgeon as part of an operation) [syn: {section}, {surgical
        incision}]