Etymology
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excitation (n.)

late 14c., excitacioun, "act of rousing to action; instigation, incitement; state of being excited," from Old French excitation, from Late Latin excitationem (nominative excitatio), noun of action from past-participle stem of excitare "to call out, wake, rouse, stir up" (see excite).

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Definitions of excitation

excitation (n.)
the state of being emotionally aroused and worked up;
excitation (n.)
the neural or electrical arousal of an organ or muscle or gland;
Synonyms: innervation / irritation
excitation (n.)
something that agitates and arouses;
Synonyms: excitement
From wordnet.princeton.edu