Breadcrumb Home > Dictionary > Index E exact differential: Meaning and Definition of Find definitions for: exact' differen'tial Pronunciation: [key] — Math. Math. an expression that is the total differential of some function. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. exacta exacting ✖ Related Content Daily Word Quiz: rococo Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language