Borrowed from Middle French irritation, from , from irrītāre, present active infinitive of irrītō ("I excite").

• IPA: /ˌɪɹɪˈteɪʃən/

irritation

1. The act of irritating or annoying

   What irritation causes you to be so moody?

2. The state of being irritated
3. A things or person that annoys

   Synonyms: pain in the neck

4. (physiology) a state of inflammation or painful reaction to allergy or cell-lining damage.
5. 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.
   • 1975, Richard I. Feinbloom, Children's Hospital Medical Center, Child Health Encyclopedia: The Complete Guide for Parents:

     Hip pain is a common complaint in children and may indicate a very mild irritation in the hip joint or may be the symptom of a very severe abnormality

• irritable
• irritate

• French: irritation
• German: Ärger, Irritation, Verärgerung
• Russian: раздраже́ние
• Spanish: irritación

• German: Irritation
• Russian: возбужде́ние

• German: Irritation
• Russian: раздраже́ние