noun
a unit of area equal to the area of a square with sides one inch long
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The irrigation system is designed to deliver one acre-inch of water per week to each field.
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Make sure to water your garden with at least one acre-inch of water every few days.
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I heard it rained so much last night, we must have gotten a few acre-inches of water!
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She poured out her emotions like an acre-inch of rain during the storm.