ARMAGEDDON (Är·mȧ·gĕdʹ dŏn) Middle East site of the final battle between the forces of good and evil (Rev. 16:16). The word “Armageddon” appears once in Scripture and is not found in Hebrew literature. Translators transliterate the term from Greek into English in several ways: Armageddon (KJV); Har Magedon (NASB); and Harmageddon (Moffatt). The Greek is an approximate transliteration of the Hebrew har megiddo, literally, “mountain of Megiddo.” Revelation promises that in the face of defeat of God’s saints by military forces from the east, south, and the north, the Lord Jesus Christ will return to defeat His enemies and deliver His people. See Megiddo.
Kenneth Hubbard

Hubbard, K. (2003). Armageddon. In C. Brand, C. Draper, A. England, S. Bond, E. R. Clendenen, & T. C. Butler (Eds.), Holman Illustrated Bible Dictionary (pp. 114–115). Nashville, TN: Holman Bible Publishers.