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kilometer
[ noun ]
a metric unit of length equal to 1000 meters (or 0.621371 miles)
<noun.quantity> 
Kilometer \Kil"o*me`ter\, Kilometre \Kil"o*me`tre\, n. [F.
kilometre. See {Kilogram}, and {Meter}.]
A measure of length, being a thousand meters. It is equal to
3,280.84 feet, or 0.62137119 of a mile.