noun
three persons; three parties
Refers to three people or three groups/parties, often used in formal, legal, or news contexts such as 三者会談 (three-party talks) or 三者面談 (three-way meeting).
三者面談で進路について話し合った。
We discussed career paths in a three-way meeting.
三者による合意が成立した。
An agreement was reached by the three parties.