/ Dictionary / Index C circle of curvature: Meaning and Definition of Find definitions for: cir'cle of cur'vature Pronunciation: [key] — Math. Math. the circle with its center on the normal to the concave side of a curve at a given point on the curve and with its radius equal to the radius of curvature at the point. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. circle of convergence circle of declination Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language