/ Dictionary / Index C C.E.F.: Meaning and Definition of Find definitions for: C.E.F. Pronunciation: [key] Canadian Expeditionary Force. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. CEEB cefaclor Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language