/ Dictionary / Index C common divisor: Meaning and Definition of Find definitions for: com'mon divi'sor Pronunciation: [key] — Math. Math. a number that is a submultiple of all the numbers of a given set. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. common disaster commoner Related Content Daily Word Quiz: reluctant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language