orderly : Idioms & Phrases

• (Mil.), a book for every company, in which the general and regimental orders are recorded.

Webster 1913

• the officer of the day, or that officer of a corps or regiment whose turn it is to supervise for the day the arrangements for food, cleanliness, etc. Farrow.

Webster 1913

• . (a) The court of the commanding officer, where charges against the men of the regiment are tried . (b) The office of the commanding officer, usually in the barracks, whence orders emanate. Farrow.

Webster 1913

• noun the first sergeant of a company; duties formerly included the conveyance of orders
  

WordNet

• the first sergeant of a company.

Webster 1913