/ Dictionary / Index H highest common factor: Meaning and Definition of Find definitions for: high'est com'mon fac'tor Pronunciation: [key] — Math. Math. SeeAbbr.: H.C.F. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. higher-up Highet Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language