/ Dictionary / Index M multinomial: Meaning and Definition of Find definitions for: mul•ti•no•mi•al Pronunciation: (mul"ti-nō'mē-ul), [key] — n. Algebra. Now Rare. polynomial (def. 3c). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: multinomial (Thesaurus) multinational multinominal Related Content Daily Word Quiz: longevity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language