Merriam-Webster's Collegiate® Dictionary, 11th Edition
CHAIR
I. noun see: sit
Date: 13th century
1. a seat typically having four legs and a back for one person, electric chair ,
2. an official seat or a seat of authority, state, or dignity, an office or position of authority or dignity, professorship , chairman 1, a sedan chair, a position of employment usually of one occupying a chair or desk, any of various devices that hold up or support,
II. transitive verb
Date: 1552
to install in office, to carry on the shoulders in acclaim , to preside as chairman of