(n.) The act of irritating, or exciting, or the state of
being irritated; excitement; stimulation, usually of an undue and
uncomfortable kind; especially, excitement of anger or passion;
provocation; annoyance; anger.
(n.) The act of exciting, or the condition of being excited
to action, by stimulation; -- as, the condition of an organ of sense,
when its nerve is affected by some external body; esp., the act of
exciting muscle fibers to contraction, by artificial stimulation; as,
the irritation of a motor nerve by electricity; also, the condition of
a muscle and nerve, under such stimulation.
(n.) A condition of morbid excitability or oversensitiveness
of an organ or part of the body; a state in which the application of
ordinary stimuli produces pain or excessive or vitiated action.
