cannon or artillery.
military weapons with their equipment, ammunition, etc.
the branch of an army that procures, stores, and issues, weapons, munitions, and combat vehicles and maintains arsenals for their development and testing.

1620–30; syncopated variant of ordinance

ordinance, ordnance, ordonnance.
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World English Dictionary
ordnance (ˈɔːdnəns)
1.  cannon or artillery
2.  military supplies; munitions
3.  the ordnance a department of an army or government dealing with military supplies
[C14: variant of ordinance]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"cannon, artillery," a clipped form of ordinance (q.v.) which was attested from late 14c. in the sense of "military materials, provisions of war;" a sense now obsolete but which led to those of "engines for discharging missiles" (early 15c.) and "branch of the military
concerned with stores and materials" (late 15c.). The shorter word was established in these distinct senses by 17c. Ordnance survey (1833), official survey of Great Britain and Ireland, was undertaken by the government under the direction of the Master-General of the Ordnance (a natural choice, because gunners have to be skilled at surveying ranges and distances).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Copper is used in everything from automobiles to ordnance.
And instead of a paintbrush, he has weapons-grade ordnance.
She was watching over the sailors in the red shirts, the uniform that signifies
  ordnance handlers.
But this theme, too, is smothered by the interminable descriptions of fires and
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