chair -- (a seat for one person, with a support for the back; "he put his coat over the back of the chair and sat down")
professorship, chair -- (the position of professor; "he was awarded an endowed chair in economics")
president, chairman, chairwoman, chair, chairperson -- (the officer who presides at the meetings of an organization; "address your remarks to the chairperson")
electric chair, chair, death chair, hot seat -- (an instrument of execution by electrocution; resembles an ordinary seat for one person; "the murderer was sentenced to die in the chair")
chair -- (a particular seat in an orchestra; "he is second chair violin")
Overview of verb chair
The verb chair has 2 senses
chair, chairman -- (act or preside as chair, as of an academic department in a university; "She chaired the department for many years")
moderate, chair, lead -- (preside over; "John moderated the discussion")