Kilometre

[Britney]

A measure of length, being a thousand meters. It is
equal to 3,280.8 feet, or 62137 of a mile.

[Britney]

Often [misspelt] as [kilometer].
The kilometre (SI symbol: km) is a unit of length in the metric system, equal to 1000 metres (kilo: being [the SI] prefix for 1000). It is now the measurement unit used, officially, for expressing distances between geographical places on land, in most of the world.

[Couch Potatoe]

A metric unit of measurement equal to 1,000 metres (approximately 0.62 miles).