A person who believes in or preaches the imminent apocalyptic end of the world as described in religious prophecy, particularly Armageddon.
From Armageddon (Hebrew Har Megiddo, 'Mount of Megiddo') + the suffix '-ist' (person who believes in or practices). The term emerged in modern religious discourse, particularly in the 20th century.
Armageddonists have existed across centuries, constantly predicting specific dates for the end times—and yet we're still here, which tells us something interesting about how humans find meaning through apocalyptic thinking even when predictions always fail.
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