/ Dictionary / Index C cogency: Meaning and Definition of Find definitions for: co•gen•cy Pronunciation: (kō'jun-sē), [key] — n. the quality or state of being convincing or persuasive: The cogency of the argument was irrefutable. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cogency (Thesaurus) cog cogeneration Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language