The Collaborative International Dictionary of English v.0.48:

Chairman \Chair"man\, n.; pl. Chairmen.
   1. The presiding officer of a committee, or of a public or
      private meeting, or of any organized body.
      [1913 Webster]

   2. One whose business it is to cary a chair or sedan.
      [1913 Webster]

            Breaks watchmen's heads and chairmen's glasses.
                                                  --Prior.
      [1913 Webster]