Glossary of terms

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U
U-boat

a German submarine

undercarriage

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

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