surgical operation, surgical procedure, surgical process, surgery, operation - a medical procedure involving an incision with instruments; performed to repair damage or arrest disease in a living body; they will schedule the operation as soon as an operating room is available; he died while undergoing surgery.
A quarter mile is, by definition, a fourth of a mile. It is 1,320 feet or 402.3 meters. On a standard-sized Olympic track, it is a little more than a single lap.
A quarter section, often shortened to quarter, is an area of one-fourth of a square mile, or 160 acres (0.65 km2). It was a common size of a tract under Homestead Acts in the United States and the Dominion Land Survey in Canada.