noun an ailment or disease of the body.
2. complaint ·noun cause or subject of complaint or murmuring.
3. complaint ·noun expression of grief, regret, pain, censure, or resentment; lamentation; murmuring; accusation; fault-finding.
4. complaint ·noun 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.