ordnance UK /ˈɔːdnəns/US /ˈoɹdnəns/ noun2 •Military equipment, especially weapons and ammunition.When the Turkes tooke Constantinople, they melted the Bells into Ordnance; I haue heard both Bells and Ordnance, but neuer been so much affected with those, as with these Bells. — 1624 •Artillery. formsordnances