/ Dictionary / Index R radius of convergence: Meaning and Definition of Find definitions for: ra'dius of conver'gence Pronunciation: [key] — Math. Math. a positive number so related to a given power series that the power series converges for every number whose absolute value is less than this particular number. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. radius radius of curvature Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language