The Collaborative International Dictionary of English v.0.48:

Orderly \Or"der*ly\, n.; pl. Orderlies.
   1. (Mil.) A noncommissioned officer or soldier who attends a
      superior officer to carry his orders, or to render other
      service.
      [1913 Webster]

            Orderlies were appointed to watch the palace.
                                                  --Macaulay.
      [1913 Webster]

   2. A street sweeper. [Eng.] --Mayhew.
      [1913 Webster]