Meaning of delta function

del'ta func"tion

Pronunciation: [key]
— Physics, Math. Physics,Math.
  1. a generalized function having the value 0 except at 0, the value infinity at 0, and an integral from minus infinity to plus infinity of 1, used in thermodynamics and quantum mechanics. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.