Chair (noun)

1. A piece of furniture with a back, designed to seat one person.
2. A seat of authority or office.
3. The person who presides over a meeting or organization.

Origin:

Middle english, from old french chaiere, from latin cathedra, from greek kathedra seat, from kata down + hedra seat.

Examples:

1. She sat down in a comfortable chair.
2. The chairman of the board made an announcement.
3. He will serve as the chair of the committee.
4. The chairs were arranged in a circle.
5. The chair of the department will be stepping down at the end of the semester.