Complainant (noun)

1. A person who makes a complaint, especially to a court or other authority.
2. A person who brings a formal charge against someone, especially in a legal context.

Origin:

Mid 16th century: from latin complainant- "lamenting", from the verb complainere.

Examples:

1. The complainant claimed that the defendant had stolen money from her.
2. The judge listened carefully to the testimony of the complainant and the defendant.
3. The police took a statement from the complainant, who was the victim of the robbery.
4. The complainant appeared in court, seeking justice for the wrongs that had been done to her.
5. The complainant filed a complaint with the Equal Employment Opportunity Commission, alleging discrimination in the workplace.