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Smith's Bible Dictionary
Armaged'don. (the hill of Megiddo or the city of Megiddo). Revelation 16:16. The scene of the struggle of good and evil is suggested by that battle-field, the 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, 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, that is, the hill (as Ar is the city) of Megiddo. - Editor).
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Smith, William, Dr. Entry for 'Armageddon'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/a/armageddon.html. 1901.