/ Dictionary / Index I integral equation: Meaning and Definition of Find definitions for: in'tegral equa'tion Pronunciation: [key] — Math. Math. an equation in which an integral involving a dependent variable appears. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. integral domain integral function Related Content Daily Word Quiz: blanch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language