noun
Refers to a person who attends a meeting, conference, or gathering. Slightly formal; common in business and event contexts.
会議の参会者は全員時間通りに到着した。
All the meeting attendees arrived on time.
セミナーの参会者数は百人を超えた
The number of seminar participants exceeded one hundred.
参会 (attending a meeting) + 者 (person). The exact historical derivation is uncertain, but the word is a straightforward compound of Sino-Japanese elements.