GNU Collaborative International Dictionary of English

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1.       
   Ordnance , n. [From OE. ordenance, referring orig. to the bore or size of the cannon. See Ordinance.] Heavy weapons of warfare; cannon, or great guns, mortars, and howitzers; artillery; sometimes, a general term for all weapons, ammunitiion, and appliances used in war.
   1913 Webster
   All the battlements their ordnance fire.
   Shak.
   
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   Then you may hear afar off the awful roar of his [Rufus Choate's] rifled ordnance.
   E. Everett.
   
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   Ordnance survey, the official survey of Great Britain and Ireland, conducted by the ordnance department.
   1913 Webster