Miles per hour and Mph

Miles per hour noun - A speedometer reading for the momentary rate of travel.

Mph is a synonym for miles per hour. In some cases you can use "Mph" instead a noun phrase "Miles per hour".

Mph noun - The ratio of the distance traveled (in miles) to the time spent traveling (in hours).

Miles per hour is a synonym for mph. You can use "Miles per hour" instead a noun "Mph".