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Definitions of catastrophism:
  • noun:   (geology) The doctrine that sudden catastrophes, rather than continuous change, cause the main features of the Earth's crust.
  • noun:   (biology) The doctrine that, in addition to the more gradual effects of evolution, huge catastrophic events shape the earth's flora and fauna by causing major die-offs which make way for the emergence of new organisms.
  • noun:   The practice or tendency of catastrophizing, regarding bad things as catastrophic.

(Definitions from Wiktionary)

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