1 seat, armchair, stool, bench, easy chair, rocking-chair:
He offered me a chair so I sat down.
2 throne, bench, position, cathedra, authority; professorship, directorship:
Sue has been offered a chair on the board.
3 chairperson, chairman, chairwoman, presiding officer, leader, moderator:
The chair ruled on the matter after due consideration.
4 preside, lead, govern, moderate, run, direct, manage, oversee:
Katherine will chair the meetings during the absence of the president.