armageddon

from WordNet (r) 3.0 (2006)

Armageddon
    n 1: (New Testament) the scene of the final battle between the
         kings of the Earth at the end of the world
    2: any catastrophically destructive battle; "they called the
       first World War an Armageddon"

from The Collaborative International Dictionary of English v.0.48

Armageddon \Ar`ma*ged"don\ ([aum]r*m[.a]"j[e^]"d'n), n.
   the final, decisive battle between the forces of good and
   evil, as foretold in the Apocolypse of Saint John. Also, the
   site of that battle. Used metaphorically for a vast and
   decisive conflict, attended by cataclysmic destruction.
   [PJC]

from Easton's 1897 Bible Dictionary

Armageddon
occurs only in Rev. 16:16 (R.V., "Har-Magedon"), as symbolically
designating the place where the "battle of that great day of God
Almighty" (ver. 14) shall be fought. The word properly means the
"mount of Megiddo." It is the scene of the final conflict
between Christ and Antichrist. The idea of such a scene was
suggested by the Old Testament great battle-field, the plain of
Esdraelon (q.v.).

from Hitchcock's Bible Names Dictionary (late 1800's)

Armageddon, hill of fruits; mountain of Megiddo

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