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The acre is a [[statute measure]] in the [[United States]] and was formerly one in the [[United Kingdom]] and almost all countries of the former [[British Empire]], although informal use continues.
The acre is a [[statute measure]] in the [[United States]] and was formerly one in the [[United Kingdom]] and almost all countries of the former [[British Empire]], although informal use continues.


The international symbol of the acre is '''ac'''.<ref>{{cite EU regulation |serial= 71/354/EEC | date= 18 October 1971 |description= On the approximation of the laws of the Member States relating to units of measurement| eurlextag= CELEX:31980L0181}}</ref> In the United States both the international acre and the US survey acre are in use, but they differ by only two parts per million: see below. The most common use of the acre is to measure tracts of land.
In the United States both the international acre and the US survey acre are in use, but they differ by only two parts per million: see below. The most common use of the acre is to measure tracts of land.


Traditionally, in the [[Middle Ages]], an acre was defined as the area of land that could be [[plough]]ed in one day by a ''[[yoke]]'' of [[ox]]en.<ref name=nottingham>{{cite web|url=https://www.nottingham.ac.uk/manuscriptsandspecialcollections/researchguidance/weightsandmeasures/measurements.aspx|title=Manuscripts and Special Collections - Measurements|publisher = the [[University of Nottingham]]| accessdate= 1 August 2018}}</ref>
Traditionally, in the [[Middle Ages]], an acre was defined as the area of land that could be [[plough]]ed in one day by a ''[[yoke]]'' of [[ox]]en.<ref name=nottingham>{{cite web|url=https://www.nottingham.ac.uk/manuscriptsandspecialcollections/researchguidance/weightsandmeasures/measurements.aspx|title=Manuscripts and Special Collections - Measurements|publisher = the [[University of Nottingham]]| accessdate= 1 August 2018}}</ref>