/ Dictionary / Index D Dirac delta function: Meaning and Definition of Find definitions for: Dirac' del'ta func"tion Pronunciation: [key] — Physics, Math. Physics,Math. SeeAlso called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Dirac diradical Related Content Daily Word Quiz: digression Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language