The act of irritating or annoying.
What irritation causes you to be so moody?
The state of being irritated.
It has already been established that the crew was competent and qualified for operation of AS66. With the exception of some overtones of irritation about the manner in which another aircraft, N799Y, affected the flight's progress into the Juneau area, the recorded cockpit conversation, in general, reflects a relaxed but businesslike atmosphere.
A thing or person that annoys.
Borrowed from Middle French irritation, from Latin irrītātiō, from irrītāre (“to excite”).
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