The term 'Square-Mile Fractions' refers to the measurement of land area in terms of ACRES. An acre is a unit of area equal to 43, 560 square feet, or 4, 047 square meters. It is commonly used to measure land area in the United States and other countries. The term 'Square-Mile Fractions' is used to describe the amount of land area in terms of ACRES, with one acre being equal to 1/640th of a square mile.