/ Dictionary / Index C complex fraction: Meaning and Definition of Find definitions for: com'plex frac'tion Pronunciation: [key] — Math. Math. a fraction in which the numerator or the denominator or both contain one or more fractions. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. complex carbohydrate complexing agent Related Content Daily Word Quiz: bungled Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language