chair - noun

a seat for one person, with a support for the back

the position of professor

the officer who presides at the meetings of an organization

an instrument of execution by electrocution; resembles an ordinary seat for one person

a particular seat in an orchestra

chair - verb

• act or preside as chair, as of an academic department in a university
• preside over

chair - thesaurus

chairman   chairperson   chairwoman   lead   moderate   president   professorship