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From The Collaborative International Dictionary of English v.0.48:
Ordnance \Ord"nance\, 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. [1913 Webster] Then you may hear afar off the awful roar of his [Rufus Choate's] rifled ordnance. --E. Everett. [1913 Webster] Ordnance survey, the official survey of Great Britain and Ireland, conducted by the ordnance department. [1913 Webster]