资料来源 : Webster's Revised Unabridged Dictionary (1913)

Assuetude \As"sue*tude\, n. [L. assuetudo, fr. assuetus
   accustomed.]
   Accustomedness; habit; habitual use.

         Assuetude of things hurtful doth make them lose their
         force to hurt.                           --Bacon.