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The kilometer is a unit of length in the metric system equal to one thousand meters (1 km = 1,000 m), the base unit of length in the International System of Units (SI).
The kilometer (km) is also equal to approximately 0.6214 miles (mi), or 3,280.8 feet (ft), or 39,370.0787 inches (in) or 1,093.6 yards (yd), which are US customary / Imperial units of length.
The kilometer is commonly used worldwide as a unit of length for expressing distances between two different geographical places.
Also called: kilometre (plural: kilometres, Int. spelling), klick (a slang term in the military)