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Definition of: excitation
(ek′sī·tā′shən) noun
1. A state of disturbance or agitation; excitement.
2. Physics a The deflection of an electron from its normal orbit in an atom to one of higher energy content: also called activation. b The electrification or magnetization of a substance.
3. Biol. The action of a stimulus on a plant or animal organism. [<F <L excitatio, -onis <excitare. See EXCITE.]
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