'Irritation' definitions:

Definition of 'irritation'

From: WordNet
noun
The psychological state of being irritated or annoyed [syn: irritation, annoyance, vexation, botheration]
noun
A sudden outburst of anger; "his temper sparked like damp firewood" [syn: pique, temper, irritation]
noun
(pathology) abnormal sensitivity to stimulation; "any food produced irritation of the stomach"
noun
The neural or electrical arousal of an organ or muscle or gland [syn: excitation, innervation, irritation]
noun
An uncomfortable feeling of mental painfulness or distress [syn: discomfort, soreness, irritation]
noun
Unfriendly behavior that causes anger or resentment [syn: aggravation, irritation, provocation]
noun
The act of troubling or annoying someone [syn: annoyance, annoying, irritation, vexation]

Definition of 'Irritation'

From: GCIDE
  • Irritation \Ir`ri*ta"tion\, n. [L. irritatio: cf. F. irritation.] [1913 Webster]
  • 1. 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. [1913 Webster]
  • The whole body of the arts and sciences composes one vast machinery for the irritation and development of the human intellect. --De Quincey. [1913 Webster]
  • 2. (Physiol.) 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. [1913 Webster]
  • 3. (Med.) 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. [1913 Webster]