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1.
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.
John was given a speeding ticket last night; according to the police officer, he was travelling 60 kilometres per hour or km/h, over the speed limit.

The Tagus Bridge in Lisbon, Portugal has a central span of 1.013 kilometres or km.
by James Imperial January 23, 2014