第三者

1. Origins, structure, and basic meaning

• Structure: Spelling: 第三者. Reading: だいさんしゃ. Core meaning: third party.
• Basic usage: Representative examples: 契約書を第三者にも読んでもらい、表現を確認した / 当事者だけで解決できず、第三者が話し合いに加わった.

2. Common pitfalls and similar expressions

• A person outside the parties
  • 第三者 is a person or organization not directly party to an event, contract, or dispute. In this context, it should not be interpreted as the grammatical third person.