/ Dictionary / Index U unit factor: Meaning and Definition of Find definitions for: u'nit fac"tor Pronunciation: [key] — Biol. Biol. a gene; a sequence of nucleotides that functions as the hereditary unit for a single character. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. unit element unit investment trust Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language