/ Dictionary / Index P preexist: Meaning and Definition of Find definitions for: pre•ex•ist Pronunciation: (prē"ig-zist'), [key] — v.i. to exist beforehand. to exist in a previous state. —v.t. to exist prior to (something or someone else); precede: primitive artifacts that preexisted sophisticated tools. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: preexist (Thesaurus) preexilian preexposure Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language