com·plaint 
(kəm-plānt)
(kəm-plānt)n.
1. An expression of pain, dissatisfaction, or resentment.
2. A cause or reason for complaining; a grievance: What is your complaint?
3.
a. A bodily disorder or disease; a malady or ailment.
b. The symptom or distress about which a patient seeks medical assistance.
4. Law
a. A formal statement initiating a lawsuit by specifying the facts and legal grounds for the relief sought.
b. A formal charge, made under oath, of the commission of a crime or other such offense.
[Middle English compleinte, from Old French complainte, from feminine past participle of complaindre, to complain; see COMPLAIN.]