/ Dictionary / Index C cost-efficient: Meaning and Definition of Find definitions for: cost-ef•fi•cient Pronunciation: (kôst'i-fish'unt, kost'-), [key] — adj. cost-effective. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cost-efficient (Thesaurus) cost-effective Costello Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language