noun
Formal term for a person taking part in an event, meeting, study, or activity. Often used in academic, business, or official contexts.
会議の参与者は全員、事前に資料を読んでおく必要がある。
All participants in the meeting must read the materials in advance.
この研究の参与者は20代の女性に限られている。
The participants in this study are limited to women in their twenties.
Compound of 参与 (participation) + 者 (person). The word is a Sino-Japanese term used in formal writing.