/ ˈeɪkə(r); NAmE / noun
a unit for measuring an area of land; 4 840 square yards or about 4 050 square metres :
3 000 acres of parkland
a three-acre wood
( informal )
Each house has acres of space around it (= a lot of space) .
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WORD ORIGIN
Old English æcer (denoting the amount of land a yoke of oxen could plough in a day), of Germanic origin; related to Dutch akker and German Acker field, from an Indo-European root shared by Sanskrit ajra field, Latin ager , and Greek agros .