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