IPA: /ˌɪrɪˈteɪʃən/
KK: /ɪrɪˈteɪʃən/
A feeling of annoyance or discomfort caused by something bothersome or irritating.
She felt a sense of irritation when her plans were interrupted.
Irritation → It is formed from "irritare" (meaning to provoke or excite) and the suffix "-tion" (indicating the action or process of). The word "irritation" refers to the process of provoking discomfort or annoyance.
Think of the word 'irritate' which means to provoke discomfort, and remember that 'irritation' is the process of causing that discomfort.