According to the Book of Revelation in the New Testament of the Christian Bible, Armageddon (ˌɑːrməˈgɛdən, from Ἁρμαγεδών Harmagedōn, Late Latin: Armagedōn, from Hebrew: Har Məgīddō) is the prophesied location of a gathering of armies for a battle during the end times, which is variously interpreted as either a literal or a symbolic location. The term is also used in a generic sense to refer to any end-of-the-world scenario. In Islamic theology, Armageddon is also mentioned in Hadith as the Greatest Armageddon or Al-Malhama Al-Kubra (the great battle).
The "mount" of Megiddo in northern Israel is not actually a mountain, but a tell (a mound or hill created by many generations of people living and rebuilding on the same spot) on which ancient forts were built to guard the Via Maris, an ancient trade route linking Egypt with the northern empires of Syria, Anatolia and Mesopotamia. Megiddo was the location of various ancient battles, including one in the 15th century BC and one in 609 BC. The nearby modern Megiddo is a kibbutz in the Kishon River area.
The word Armageddon appears only once in the Greek New Testament, in . The word is a Greek transliteration of the Hebrew har məgiddô (הר מגידו). Har means "a mountain or range of hills". This is a shortened form of harar meaning "to loom up; a mountain". Megiddo refers to a fortification made by King Ahab that dominated the Plain of Jezreel. Its name means "place of crowds".
Adam Clarke wrote in his Bible commentary (1817) on Revelation 16:16:Armageddon - The original of this word has been variously formed, and variously translated. It is הר־מגדון har-megiddon, "the mount of the assembly;" or חרמה גדהון chormah gedehon, "the destruction of their army;" or it is הר־מגדו har-megiddo, "Mount Megiddo,"
Christian eschatology
Megiddo is mentioned twelve times in the Old Testament, ten times in reference to the ancient city of Megiddo, and twice with reference to "the plain of Megiddo", most probably simply meaning "the plain next to the city".