acre · noun C /ˈeɪ.kər/Full view
C2 a unit for measuring area, equal to 4047 square meters or 4840 square yards
Dictionary example:

He owns 400 acres of land in California.

Learner example:

We have to admit that, not only because of the financial weakness but also because of the badly organized plans, we failed to achieve the planting of 10,000 trees per acre. (Certificate of Proficiency in English; C2; Japanese)

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