/ Dictionary / Index D differential geometry: Meaning and Definition of Find definitions for: differen'tial geom'etry Pronunciation: [key] — Math. Math. the branch of mathematics that deals with the application of the principles of differential and integral calculus to the study of curves and surfaces. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. differential gear differential operator Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language