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English unit refers to a unit in one of a number of systems of units of measurement, some obsolete, and some still in use. In spite of the name, it does not necessarily refer to the (non-SI) system of units still in widespread, but mostly unofficial, use in England itself. The latter is known outside the United States as the Imperial System. The American term 'English unit' includes the Imperial units as well as various other U.S. units such as the U.S. gallon (Queen Anne's wine gallon) and the U.S. bushel (Winchester bushel).