/ Dictionary / Index U unit vector: Meaning and Definition of Find definitions for: u'nit vec"tor Pronunciation: [key] — Math., Physics. Math.,Physics. a vector having a length of one unit. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. unit trust unity Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language