A religious belief system centered on the idea that the world will end in a dramatic, catastrophic event, often described in sacred texts.
From apocalypse (Greek apokalyptein 'to uncover') + -ism (denoting a system of beliefs). The term emerged in 19th-century religious studies to describe movements expecting imminent cosmic transformation.
Apocalyptism has shaped major historical events—early Christianity, medieval flagellant movements, and modern doomsday groups all stem from this worldview. Interestingly, the Greek root literally means 'to reveal,' not 'to destroy,' so it's originally about hidden knowledge becoming visible, not necessarily about doom.
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