A measure of land, amounting to 4 square roods, or 160 square poles or perches. The English statute acre is about 3 roods and 6 falls standard measure of Scotland. The Welsh acre contains commonly 2 English ones. The Irish acre is equal to 1 acre 2 roods and 1927/121 perches English. The number of acres in England, according to Dr. Grew, amounts to 46,080,000.