It was selected as approximately the amount of land tillable by one man behind an ox in one day. Statutory values were enacted in England by acts of Edward I, Edward III, Henry VIII, and George IV; the British "Weights and Measures Act" of 1878 defined it as containing 4,840 square yards.
Acre is the Crusader name given to the city which Israeli Arabs call "Akka" and Jews "Akko". See Akko.
Acre is the name of one of the states of Brazil.