Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The act of irritating.
  • n. The condition of being irritated; vexation: honked the horn with irritation at the delay.
  • n. A source of irritation.
  • n. Pathology A condition of inflammation, soreness, or irritability of a bodily organ or part.
  • n. Physiology The elicitation of activity or response in an animal or plant organ or tissue.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • 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.

from the GNU version of the Collaborative International Dictionary of English

  • 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; ; 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.

from The Century Dictionary and Cyclopedia

  • n. The act of irritating, or the state of being irritated; impatient or angry excitement; provocation; exasperation.
  • n. Stimulation; incitement; a stirring up to activity.
  • n. In physiology, the act of evoking some action, or change of state, in a muscle, nerve, or other living tissue, by some chemical, physical, or pathological agent; the state or action thus evoked.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a sudden outburst of anger
  • n. the neural or electrical arousal of an organ or muscle or gland
  • n. the psychological state of being irritated or annoyed
  • n. the act of troubling or annoying someone
  • n. an uncomfortable feeling of mental painfulness or distress
  • n. unfriendly behavior that causes anger or resentment
  • n. (pathology) abnormal sensitivity to stimulation

Etymologies

From Latin irritatio, from irritare ("to excite") (Wiktionary)

Examples

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