/ Dictionary / Index C catastrophism: Meaning and Definition of Find definitions for: ca•tas•tro•phism Pronunciation: (ku-tas'tru-fiz"um), [key] — n. Geol. the doctrine that certain vast geological changes in the earth's history were caused by catastrophes rather than gradual evolutionary processes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. catastrophe theory catatonia Related Content Daily Word Quiz: reclusive Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language