/ Dictionary / Index U unifactorial: Meaning and Definition of Find definitions for: u•ni•fac•to•ri•al Pronunciation: (y"nu-fak-tôr'ē-ul, -tōr'-), [key] — adj. Genetics. of or pertaining to a single gene. of a phenotypic character controlled by a single gene. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. uniface unifiable Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language