An acre is a unit of measurement used to determine the size of a piece of land. It is often used to measure large areas, such as farms or fields. One acre is equal to 43,560 square feet. Full definition
In recent decades, this has happened to millions of acres of land. (newscientist.com)
One of his designs, a wind farm, models the dynamics of large schools of fish to generate 10 times as much power per acre of land as conventional wind farms. (discovermagazine.com)
Second, the property is on hundreds of acres with 30 miles of trails. (bonappetit.com)