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orderly room

American  

noun

  1. the administrative office of a small military unit.


orderly room British  

noun

  1. military a room in the barracks of a battalion or company used for general administrative purposes

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of orderly room

Probably earlier than 1975–80