/ Dictionary / Index R root of unity: Meaning and Definition of Find definitions for: root' of u'nity Pronunciation: [key] — Math. Math. a complex number that when raised to some positive integral power results in 1. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. root mean square root position Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language