The acre is a unit of land area used in the imperial and US customary systems. It is defined as the area of 1 chain (22 yards) by 1 furlong (220 yards), which is exactly equal to of a square mile, 43,560 square feet, approximately 4,046.856 m², or about 40% of a hectare.

Action with Communities in Rural England (ACRE) is a charity that acts as the national organisation for thirty-eight Rural Community Councils across England.