King James Bible Dictionary

Occurs only in Revelation 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.).

hill of fruits; mountain of Megiddo

A symbolic name.
Revelation 16:16

(the hill or city of Megiddo). (Revelation 16:16) The scene of the struggle of good and evil is suggested by that battle-field, the plain of Esdr'lon, which was famous for two great victories, of Barak over the Canaanites and of Gideon over the Midianites; and for two great disasters, the deaths of Saul and Josiah. Hence it signifies in Revelation a place of great slaughter, the scene of a terrible retribution upon the wicked. The Revised Version gives the name as Har-Magedon , i.e. the hill (as Ar is the city) of Megiddo .

ED.)