01 n. Heavy weapons of warfare; cannon, or great guns, mortars, and howitzers; artillery; sometimes, a general term for all weapons, ammunitiion,…
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1.
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.“All the battlements their ordnance fire.” — Shak.“Then you may hear afar off the awful roar of his [Rufus Choate's] rifled ordnance.” — E. Everett.
Phrases & compounds
Ordnance survey —
the official survey of Great Britain and Ireland, conducted by the ordnance department.