Source : Webster's Revised Unabridged Dictionary (1913)

Apocalypse \A*poc"a*lypse\, n. (Eccl.)
   One of a numerous class of writings proceeding from Jewish
   authors between 250 b. c. and 150 a. d., and designed to
   propagate the Jewish faith or to cheer the hearts of the
   Jewish people with the promise of deliverance and glory; or
   proceeding from Christian authors of the opening centuries
   and designed to portray the future.

Apocalypse \A*poc"a*lypse\, n. [L. apocalypsis, Gr. ?, fr. ? to
   uncover, to disclose; ? from + ? to cover, conceal: cf. F.
   apocalypse.]
   1. The revelation delivered to St. John, in the isle of
      Patmos, near the close of the first century, forming the
      last book of the New Testament.

   2. Anything viewed as a revelation; a disclosure.

            The new apocalypse of Nature.         --Carlyle.

Source : WordNet®

apocalypse
     n 1: a cosmic cataclysm in which God destroys the ruling powers
          of evil
     2: the last book of the New Testament; contains visionary
        descriptions of heaven and of conflicts between good and
        evil and of the end of the world; attributed to Saint John
        the apostle [syn: {Revelation}, {Revelation of Saint John
        the Divine}, {Book of Revelation}]