Glossary of terms

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a German submarine


a final offer issued in negotiations, the rejection of which can lead to a break in relations and some action


the part of a plane, including the wheels, that provides support when it is on the ground and when it is landing or taking off

unexploded ordnance

any sort of military ammunition or explosive ordnance that has failed to function as intended

United Kingdom (UK)

refers to the United Kingdom of Great Britain and Ireland from 1 January 1801 to 5 December 1922, or the United Kingdom of Great Britain and Northern Ireland from 5 December 1922

upper class

describes a group of people in a society who have the highest economic or social status