/ Dictionary / Index E ex post: Meaning and Definition of Find definitions for: ex post Pronunciation: (eks pōst'), [key] based on analysis of past performance (opposed to ex ante). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. expository ex post facto Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language