/ir'i tay"sheuhn/ , n.
1. the act of irritating or the state of being irritated.
2. something that irritates.
3. Physiol. , Pathol.
a. the bringing of a bodily part or organ to an abnormally excited or sensitive condition.
b. the condition itself.
[ 1580-90; irritation- (s. of irritatio ). See IRRITATE, -ION ]