Definition of complaint

• n. - Expression of grief, regret, pain, censure, or resentment; lamentation; murmuring; accusation; fault-finding.
• n. - Cause or subject of complaint or murmuring.
• n. - An ailment or disease of the body.
• n. - A formal allegation or charge against a party made or presented to the appropriate court or officer, as for a wrong done or a crime committed (in the latter case, generally under oath); an information; accusation; the initial bill in proceedings in equity.