/ Dictionary / Index C constancy: Meaning and Definition of Find definitions for: con•stan•cy Pronunciation: (kon'stun-sē), [key] — n. the quality of being unchanging or unwavering, as in purpose, love, or loyalty; firmness of mind; faithfulness. uniformity or regularity, as in qualities or conditions; invariableness. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: constancy (Thesaurus) Constance Constans I Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language