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The kilometre (International spelling as used by the International Bureau of Weights and Measures; SI symbol: km; {{#invoke:IPAc-en|main}} or {{#invoke:IPAc-en|main}}) or kilometer (American spelling) is a unit of length in the metric system, equal to one thousand metres (kilo- being the SI prefix for {{safesubst:#invoke:val|main}}). It is now the measurement unit used officially for expressing distances between geographical places on land in most of the world; notable exceptions are the United States and the United Kingdom where the statute mile is the official unit used.

k (pronounced {{#invoke:IPAc-en|main}}) is occasionally used in some English-speaking countries as an alternative for the word kilometre in colloquial writing and speech.<ref>{{#invoke:citation/CS1|citation |CitationClass=news }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=news }}</ref><ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> A slang term for the kilometre in the US military is klick.<ref name="About">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>


Kilometre sections
Intro  Pronunciation  Equivalence to other units of length  History  International usage  Kilometre records  See also  Notes and references   External links   

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