プログレッシブ和英中辞典(第３版)の解説
とうじ【当事】
当事国｜the countries directly concerned [involved]
当事者｜the parties concerned
- 彼は事件の当事者だ
He is directly 「involved in [concerned with] the affair.
当事者主義｜the adversary-accusatorial system
当事者能力｜the admissibility of a party to legal proceedings
- 彼にはその損害賠償の訴訟については当事者能力がない
He cannot be a party to the damage suit.