/ Dictionary / Index R rational form: Meaning and Definition of Find definitions for: ra'tional form' Pronunciation: [key] — Math. Math. a quotient of two polynomials with integral coefficients. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rational-emotive therapy rational function Related Content Daily Word Quiz: penury Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language