ˌirəˈtāshən noun
( -s )
Etymology: Middle French, from Latin irritation-, irritatio, from irritatus (past participle of irritare to irritate, provoke) + -ion-, -io -ion — more at irritate
1. : an act of irritating or a state of being irritated: as
a. : excitement to activity : stimulation
b. : excitement of impatience, anger, or passion : annoyance
c. : irritability b
2. : excitation 3 ; especially : the act of exciting a muscle to contraction by artificial stimulation