kilometer

Concise Oxford English Dictionary © 2008 Oxford University Press:
kilometre /ˈkɪləˌmiːtə, kɪˈlɒmɪtə/ (US kilometer) (abbrev.: km)

▶noun a metric unit of length equal to 1,000 metres (approximately 0.62 miles).

– derivatives
kilometric adjective.

– origin C18: from Fr. kilomètre (see kilo-, metre1).

usage: There are two possible pronunciations for kilometre: one with the stress on the ki- and the other with the stress on the -lo-. The first is traditionally considered the correct one, while the second is still regarded as incorrect by some people, especially in British English.