/ Dictionary / Index C cost unit: Meaning and Definition of Find definitions for: cost' u"nit Pronunciation: [key] a quantity or unit of a product or service whose cost is computed, used as a standard for comparison with other costs. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. costuming cosy Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language