a metric unit of length equal to 1000m (about 0.62mi)
[French kilomètre, from kilo- + mètre: see metre1]
Modern dictionaries of British English accept two ways of pronouncing kilometre – with the stress on the first syllable kil-, or with the stress on the second syllable -om-. The first is the traditional way and accords with the usual pronunciation of other metric measurements such as centimetre and kilohertz. The second is the standard American pronunciation