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English definition of “complaint”

complaint

noun [C/U]    /kəmˈpleɪnt/
a statement that something is wrong or not good enough, the act of complaining, or the thing you are complaining about: [U] a letter of complaint [C] Her only complaint is that she sometimes didn’t get enough heat in her apartment. law A complaint is also a formal statement to a government authority that you have a legal cause to complain about the way you have been treated: [C] He filed a complaint with the commission, charging discrimination based on his disability.
(Definition of complaint noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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