Breadcrumb Home > Dictionary > Index U unisonous: Meaning and Definition of Find definitions for: u•nis•o•nous Pronunciation: (y-nis'u-nus), [key] — adj. being in unison. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. unison unispiral ✖ Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language