Chair (acrobatics) definition

(1) The position of professor

"He was awarded an endowed chair in economics"

(2) A seat for one person, with a support for the back

"He put his coat over the back of the chair and sat down"

(3) An instrument of execution by electrocution; resembles an ordinary seat for one person

"The murderer was sentenced to die in the chair"

(4) The officer who presides at the meetings of an organization

"Address your remarks to the chairperson"

(5) Preside over

"John moderated the discussion"

(6) Act or preside as chair, as of an academic department in a university

"She chaired the department for many years"