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From 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]