Source : Webster's Revised Unabridged Dictionary (1913)

Revelation \Rev`e*la"tion\, n. [F. r['e]v['e]lation, L.
   revelatio. See {Reveal}.]
   1. The act of revealing, disclosing, or discovering to others
      what was before unknown to them.

   2. That which is revealed.

   3. (Theol.)
      (a) The act of revealing divine truth.
      (b) That which is revealed by God to man; esp., the Bible.

                By revelation he made known unto me the mystery,
                as I wrote afore in few words.    --Eph. iii. 3.

   4. Specifically, the last book of the sacred canon,
      containing the prophecies of St. John; the Apocalypse.

Source : WordNet®

revelation
     n 1: the speech act of making something evident [syn: {disclosure},
           {revealing}]
     2: an enlightening or astonishing disclosure
     3: communication of knowledge to man by a divine or
        supernatural agency
     4: 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 of Saint John the Divine}, {Apocalypse},
         {Book of Revelation}]