/ Dictionary / Index C cusec: Meaning and Definition of Find definitions for: cu•sec Pronunciation: (ky'sek), [key] — n. a unit of flow of one cubic foot per second. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Cusco cush Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language