chair

noun

the position of professor
“I was awarded an endowed chair in economics.”
professorship
a seat for one person, with a support for the back
“They put their coat over the back of the chair and sat down.”
a particular seat in an orchestra
“They are second chair violin.”
an instrument of execution by electrocution

hot seatelectric chairdeath chair
the officer who presides at the meetings of an organization
“address your remarks to the chairperson”
presidentchairmanchairwomanchairperson

verb

to preside over
“I volunteered to chair the committee.”
moderatelead
to act or preside as chair, as of an academic department in a university
“I chaired the department for many years.”
chairman