Source : Webster's Revised Unabridged Dictionary (1913)

Mischance \Mis*chance"\, n. [OE. meschance, OF. mescheance.]
   Ill luck; ill fortune; mishap. --Chaucer.

         Never come mischance between us twain.   --Shak.

   Syn: Calamity; misfortune; misadventure; mishap; infelicity;
        disaster. See {Calamity}.

Mischance \Mis*chance"\, v. i.
   To happen by mischance. --Spenser.

Source : WordNet®

mischance
     n 1: an unpredictable outcome that is unfortunate; "if I didn't
          have bad luck I wouldn't have any luck at all" [syn: {bad
          luck}, {mishap}]
     2: an instance of misfortune [syn: {mishap}, {misadventure}]