noun

1. The act of complaining.

2. A grievance, problem, difficulty, or concern.

   “I have no complaints about the quality of his work, but I don't enjoy his company.”

3. In a civil action, the first pleading of the plaintiff setting out the facts on which the claim is based; The purpose is to give notice to the adversary of the nature and basis of the claim asserted.

Synonyms: (criminal) charges, (penal) charge, complaint of an offence/offense, criminal complaint, criminal information, informing the police/authorities, notification of the police/authorities, reporting an offence/offense to the police/authorities