definition of
chair

[1] #1 chair n. a seat for one person, with a support for the back; "he put his coat over the back of the chair and sat down". wn

[2] #2 chair n. [professorship] the position of professor; "he was awarded an endowed chair in economics". wn

[3] #3 chair v. [chairman] act or preside as chair, as of an academic department in a university; "She chaired the department for many years". wn

[4] #4 chair v. [moderate, lead] preside over; "John moderated the discussion". wn

[5] #5 chair n. [president, chairman, chairwoman, chairperson] the officer who presides at the meetings of an organization; "address your remarks to the chairperson". wn