/ Dictionary / Index R Riemann integral: Meaning and Definition of Find definitions for: Rie'mann in"tegral Pronunciation: [key] — Math. Math. integral (def. 8a). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Riemannian geometry Riemann sphere Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language