/ Dictionary / Index U unimodular: Meaning and Definition of Find definitions for: u•ni•mod•u•lar Pronunciation: (y"nu-moj'u-lur), [key] — adj. Math. (of a matrix) having its determinant equal to 1. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. unimodal unimpeachable Related Content Daily Word Quiz: hedonist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language