[ek-sahy-tey-shuhn, -si-]
the act of exciting.
the state of being excited.
the application of voltage to an electric device, as an electron-tube circuit, an antenna, or a dynamotor, often for producing a magnetic field in the device.
the voltage applied.
Physics. a process in which a molecule, atom, nucleus, or particle is excited.
Also called drive. Electronics. the varying voltage applied to the control electrode of a vacuum tube.

1350–1400; Middle English excitacioun < Late Latin excitātiōn- (stem of excitātiō), equivalent to Latin excitāt(us) (past participle of excitāre; see excite) + -iōn- -ion

preexcitation, noun
superexcitation, noun
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World English Dictionary
excitation (ˌɛksɪˈteɪʃən)
1.  the act or process of exciting or state of being excited
2.  a means of exciting or cause of excitement
3.  a.  the current in a field coil of a generator, motor, etc, or the magnetizing current in a transformer
 b.  (as modifier): an excitation current
4.  the action of a stimulus on an animal or plant organ, inducing it to respond

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1400, from Fr. excitation, from L. excitationem, noun of action from excitare (see excite).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

excitation ex·ci·ta·tion (ěk'sī-tā'shən)

  1. The act of increasing the rapidity or intensity of the physical or mental processes; stimulation.

  2. The complete, all-or-none response of a nerve or muscle to an adequate stimulus, ordinarily including propagation of excitation along the membranes of the cell or cells involved.

The American Heritage® Stedman's Medical Dictionary
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American Heritage
Science Dictionary
excitation   (ěk'sī-tā'shən)  Pronunciation Key 
The activity produced in an organ, tissue, or cell of the body that is caused by stimulation, especially by a nerve or neuron. Compare inhibition.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Cocaine dampens the excitation of nerve endings and the transmission of information along nervous pathways.
The resulting cellular excitation causes neurons to fire excessively.
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