Meaning of action potential

ac'tion poten"tial

Pronunciation: [key]
— Physiol. Physiol.
  1. the change in electrical potential that occurs between the inside and outside of a nerve or muscle fiber when it is stimulated, serving to transmit nerve signals. Cf. nerve impulse.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.