/ Dictionary / Index C common fraction: Meaning and Definition of Find definitions for: com'mon frac'tion Pronunciation: [key] — Arith. Arith. a fraction represented as a numerator above and a denominator below a horizontal or diagonal line. Also calledCf. decimal fraction, mixed number. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Common Era common grackle Related Content Daily Word Quiz: lyre Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language