1. A piece of furniture consisting of a seat, legs, back, and often arms, designed to accommodate one person.
2. A seat of office, authority, or dignity, such as that of a bishop.
3. An office or position of authority, such as a professorship.
4. A person who holds an office or a position of authority, such as one who presides over a meeting or administers a department of instruction at a college; a chairperson.
5. The position of a player in an orchestra.
6. Slang The electric chair.
7. A seat carried about on poles; a sedan chair.
8. Any of several devices that serve to support or secure, such as a metal block that supports and holds railroad track in position.
9. To install in a position of authority, especially as a presiding officer.
10. To preside over as chairperson:
chair a meeting.
11. Middle English chaiere
12. from Old French