/ Dictionary / Index P partial differential: Meaning and Definition of Find definitions for: par'tial differen'tial Pronunciation: [key] — Math. Math. an expression obtained from a given function of several variables by taking the partial derivative with respect to one of the variables and multiplying by the increment in that variable. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. partial derivative partial differential equation Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language