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1. The ratio of the distance travelled (in kilometres) to the time spent travelling (in seconds).
   - kilometers per second, kilometres per second

1. A metric unit of length equal to 1000 meters (or 0.621371 miles)
   - kilometer [US], kilometre [Brit, Cdn], klick [informal]

Type of: metric linear unit, rate

Part of: mym, myriameter [Brit, US], myriametre [Brit, Cdn]

Encyclopedia: Km