/ Dictionary / Index S Simpson's rule: Meaning and Definition of Find definitions for: Simp'son's rule' Pronunciation: [key] — Math. Math. a method for approximating the value of a definite integral by approximating, with parabolic arcs, the area under the curve defined by the integrand. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Simpson simpulum Related Content Daily Word Quiz: tenacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language