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1.
(1) Someone who believes the New Testament end of times is imminent.

(2) An adherent of a political or religious sect that seeks to hasten that end.

(3) More generally, someone who believes in imminent catastrophe, be it political, financial, environmental, etc.
Bad News for 2010 Armageddonists: Comet Elenin Won’t Destroy Planet Earth!
by chiefs_orange October 14, 2011