chair

Act or preside as chair, as of an academic department in a university.

“She chaired the department for many years”

Preside over.

The officer who presides at the meetings of an organization.

“address your remarks to the chairperson”

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

“the murderer was sentenced to die in the chair”

The position of professor.

“he was awarded an endowed chair in economics”

A particular seat in an orchestra.

“he is second chair violin”

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

“he put his coat over the back of the chair and sat down”