A chairman or chairwoman, someone who presides over a meeting, board, etc.
noun
An item of furniture used to sit on or in, comprising a seat, legs, back, and sometimes arm rests, for use by one person. Compare stool, couch, sofa, settee, loveseat and bench.
“All I need to weather a snowstorm is hot coffee, a warm fire, a good book and a comfortable chair.”
The seating position of a particular musician in an orchestra.
“My violin teacher used to play first chair with the Boston Pops.”