noun
Legal term for a person involved in a lawsuit, especially the one bringing the case. In everyday contexts, 原告 is more common for plaintiff.
訴訟人は裁判所に証拠を提出した。
The litigant submitted evidence to the court.
被告 is the defendant, the party being sued; 訴訟人 can refer to either plaintiff or defendant.
Compound of 訴訟 (lawsuit) and 人 (person).