Source : Webster's Revised Unabridged Dictionary (1913)

Banishment \Ban"ish*ment\, n. [Cf. F. bannissement.]
   The act of banishing, or the state of being banished.

         He secured himself by the banishment of his enemies.
                                                  --Johnson.

         Round the wide world in banishment we roam. --Dryden.

   Syn: Expatriation; ostracism; expulsion; proscription; exile;
        outlawry.

Source : WordNet®

banishment
     n 1: the state of being banished or ostracized (excluded from
          society by general consent); "the association should get
          rid of its elderly members--not by euthanasia, of
          course, but by Coventry" [syn: {ostracism}, {Coventry}]
     2: rejection by means of an act of banishing or proscribing
        someone [syn: {proscription}]