Kilometer vs. Kilometre

Kilometer and Kilometre Definitions
Kilometer
A metric unit of length equal to 1,000 meters (0.62 mile). See Table at measurement.
Kilometre
A metric unit of length equal to 1000 meters (or 0.621371 miles)
Kilometer
Alternative spelling of kilometre
Kilometer
A measure of length, being a thousand meters. It is equal to 3,280.84 feet, or 0.62137119 of a mile.
Kilometer
A metric unit of length equal to 1000 meters (or 0.621371 miles)