The definition of a kilometer is a unit of measurement equal to 1,000 meters or .6214 miles.
An example of a kilometer is how far a person will run if she wants to run for just over 1/2 of a mile.
A metric unit of length equal to 1,000 meters (0.62 mile).
A unit of length in the metric system equal to 1,000 meters (0.62 mile).
One thousand meters (3,280.84 feet or 0.6214 miles)