1. a common measure of area: in the U.S. and U.K., 1 acre equals 4,840 square yards (4,047 square meters) or 0.405 hectare; 640 acres equals one square mile.
2. acres. lands; land: wooded acres.
Informal. large quantities: acres of Oriental rugs.
3. Archaic. a plowed or sown field.
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