/ Dictionary / Index B Bessel function: Meaning and Definition of Find definitions for: Bes'sel func"tion Pronunciation: [key] — Math. Math. one of several transcendental functions, usually represented as power series, that are solutions to a group of related differential equations. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Bessel Bessel method Related Content Daily Word Quiz: sinister Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language