Толковый словарь английского языка Oxford English Reference - excitation

n. 1 a the act or an instance of exciting. b the state of being excited; excitement. 2 the action of an organism, tissue, etc., resulting from stimulation. 3 Electr. a the process of applying current to the winding of an electromagnet to produce a magnetic field. b the process of applying a signal voltage to the control electrode of an electron tube or the base of a transistor. 4 Physics the process in which an atom etc. acquires a higher energy state.