Source : Webster's Revised Unabridged Dictionary (1913)

Ligation \Li*ga"tion\ (l[-i]*g[=a]"sh[u^]n), n. [L. ligatio, fr.
   ligare to bind. Cf. {Liaison}.]
   1. The act of binding, or the state of being bound.

   2. That which binds; bond; connection.

            Tied with tape, and sealed at each fold and
            ligation.                             --Sir W.
                                                  Scott.

Source : WordNet®

ligation
     n : (surgery) tying a duct or blood vessel with a ligature (as
         to prevent bleeding during surgery)