/ Dictionary / Index C characteristic function: Meaning and Definition of Find definitions for: char'acteris'tic func'tion Pronunciation: [key] — Math. Math. a function defined on a given set, having value 1 for every element of the set and value 0 for every element not contained in the set. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. characteristic equation characteristic polynomial Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language