n a seat for one person, with a support for the back
n the position of professor
n the officer who presides at the meetings of an organization
n an instrument of execution by electrocution; resembles an ordinary seat for one person
n a particular seat in an orchestra
v act or preside as chair, as of an academic department in a university
v preside over
n. 安乐椅;餐椅;椅子(chair的复数)