say it: ir-i-TAY-shuhn
irritation is a noun meaning "the psychological state of being irritated or annoyed". It carries 7 recorded senses.
the psychological state of being irritated or annoyed
(pathology) abnormal sensitivity to stimulation
“any food produced irritation of the stomach”
pathology
the neural or electrical arousal of an organ or muscle or gland
an uncomfortable feeling of mental painfulness or distress
unfriendly behavior that causes anger or resentment
the act of troubling or annoying someone
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for irritation come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.