Furlong

Noun

1. A unit of distance equal to one-eighth of a mile (220 yards, or 201.168 metres), now mainly used in measuring distances in farmland and horse racing.
2. A unit of land area one furlong (sense 1) square (ten acres, or about four hectares). An undefined portion of an unenclosed field.
3. A unit of land area one furlong (sense 1) square (ten acres, or about four hectares).
4. An undefined portion of an unenclosed field.
5. Synonym of stadion (“a Greek unit of distance based on standardized footraces, equivalent to about 185.4 metres”).