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Noun: miles per hour
  1. The ratio of the distance travelled (in miles) to the time spent travelling (in hours)
    "The car was going 65 miles per hour on the highway";
    - mph
     
  2. A speedometer reading for the momentary rate of travel
    "The car was travelling at 65 miles per hour on the highway";
    - mph

Type of: indication, meter reading, rate, reading

Encyclopedia: Miles per hour