The definition of an acre is a unit of measure that is equal to 43,560 square feet or a square which measures 208.71 feet by 208.71 feet.
(noun)A standard National Football League field not including the end zones is an example of something that is just over an acre.
See acre in Webster's New World College Dictionary
noun
Origin: ME < OE æcer, field (akin to Goth akrs, Ger acker, L ager) < IE *aĝros (> Gr agros), field, lit., place to which cattle are driven < base *a-: see act
See acre in American Heritage Dictionary 4
noun
Origin:
Origin: Middle English aker, field, acre
Origin: , from Old English ǽcer; see agro- in Indo-European roots
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