Longman Dictionary of Contemporary English homepage

Date: 1200-1300
Language: Late Latin
Origin: apocalypsis, from Greek, from apokalyptein 'to uncover', from apo- 'away from, off' + kalyptein 'to cover'

apocalypse

 noun
     
a‧poc‧a‧lypse [countable]
1

the apocalypse

RRC the destruction and end of the world:
anti-nuclear protestors who fear the apocalypse
2 a situation in which a lot of people die or suffer, and a lot of damage is done:
A lot of investors now fear a stock market apocalypse.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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