Source : Webster's Revised Unabridged Dictionary (1913)

Excitation \Ex`ci*ta"tion\n. [L. excitatio: cf. F. excitation.]
   1. The act of exciting or putting in motion; the act of
      rousing up or awakening. --Bacon.

   2. (Physiol.) The act of producing excitement (stimulation);
      also, the excitement produced.

Source : WordNet®

excitation
     n 1: the state of being emotionally aroused and worked up; "his
          face was flushed with excitement and his hands
          trembled"; "he tried to calm those who were in a state
          of extreme inflammation" [syn: {excitement}, {inflammation},
           {fervor}, {fervour}]
     2: the neural or electrical arousal of an organ or muscle or
        gland [syn: {innervation}, {irritation}]
     3: something that agitates and arouses; "he looked forward to
        the excitements of the day" [syn: {excitement}]