chairperson; speaker; president
The presiding officer of a formal meeting, committee, council, or legislative body. Covers roles such as chair, chairman, chairperson, speaker, or president depending on the organization.
The chairperson presided over the meeting.
彼は国会の議長に選ばれた。
He was elected Speaker of the Diet.
Mr. Tanaka served as chairperson for this meeting.
He was unanimously elected chairperson.
You must obtain the chairperson's permission before speaking.
He resigned as chairperson after the scandal.
議長 is the formal title for the chairperson of a legislative or official assembly, whereas 司会 is used more generally for meetings, ceremonies, and TV shows.
speaker and deputy speaker; chair and vice-chair; president and vice-president
authority of the chair; power of the Speaker; power of the President of the House of Councillors
Speaker of the House of Representatives