noun

• The act of complaining.
• A grievance, problem, difficulty, or concern.
• (law) In a civil action, the first pleading of the plaintiff setting out the facts on which the claim is based;
• (law) In criminal law, the preliminary charge or accusation made by one person against another to the appropriate court or officer, usually a magistrate.
• A bodily disorder or disease; the symptom of such a disorder.