/ Dictionary / Index I improper integral: Meaning and Definition of Find definitions for: improp'er in'tegral Pronunciation: [key] — Math. Math. Also calleda definite integral in which one or both of the limits of integration is infinite. a definite integral in which the integrand becomes infinite at a point or points in the interval of integration. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Improperia impropriety Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language