Armageddon = "the hill or city of Megiddo"

 1) In #Re 16:16 the scene of a the struggle of good and evil is
    suggested by that battle plain of Esdraelon, 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 in Revelation a place of great slaughter,
    the scene of a terrible retribution upon the wicked. The RSV
    translates the name as Har-Magedon, i.e. the hill (as Ar is the
    city) of Megiddo.