circle of convergence noun Mathematics. a circle associated with a given power series such that the series converges for all values of the variable inside the circle and diverges for all values outside it. Liberaldictionary.com What It Really Means to Call Someone "Crude" Can You Translate These Famous Phrases From Emoji? These Are the Longest Words in English These Are the Saddest Phrases in English Compare interval of convergence. Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019