This is the 7766th most frequent Japanese word.
司会
Host or moderator.
In this sentence, "司会" refers to the act of chairing or hosting a meeting. The word is used to indicate the role of overseeing and guiding the proceedings of the meeting.
彼が会議の司会を務めた。
He chaired the meeting.
Here, "司会" is used in a polite request for someone to take on the role of hosting or leading an event or gathering.
司会をお願いできませんか？
Could you please host the event?
In this case, "司会" combines with "者" (person) to form "司会者," indicating a person who holds the position of a host, specifically for a television program.