/ Dictionary / Index E expediential: Meaning and Definition of Find definitions for: ex•pe•di•en•tial Pronunciation: (ik-spē"dē-en'shul), [key] — adj. pertaining to or regulated by expediency. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. expedient expeditate 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