/ Dictionary / Index D differential calculus: Meaning and Definition of Find definitions for: dif'feren'tial cal'culus Pronunciation: [key] the branch of mathematics that deals with differentials and derivatives. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. differential association differential coefficient Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language