of or like an apocalypse; affording a revelation or prophecy.
pertaining to the Apocalypse or biblical book of Revelation.
predicting or presaging imminent disaster and total or universal destruction: the apocalyptic vision of some contemporary writers.
Also, apocalyptical.

1620–30; < Late Greek apokalýptikos, equivalent to apokalýpt(ein) to uncover, disclose (see apocalypse) + -ikos -ic

apocalyptically, adverb
postapocalyptic, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
apocalyptic (əˌpɒkəˈlɪptɪk)
1.  outstanding in revelation, prophecy, or significance
2.  of or like an apocalypse

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1660s, "pertaining to the 'Revelation of St. John' in the New Testament," from Gk. apokalyptikos, from apokalyptein (see apocalypse). Meaning "pertaining to the imminent end of the world" evolved by 1880s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Keeping things vague, or subject to multiple interpretations, is the real key
  to apocalyptic predictions.
Others recommend adopting some policies now as an insurance policy against
  apocalyptic tail outcomes.
But the in-air bird deaths aren't due to some apocalyptic plague or insidious
  experiment-they happen all the time, scientists say.
We are highly hedonistic and apocalyptic with our self centered needs.
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