noun
a unit of distance equal to 5,280 feet or 1.609 kilometers
preposition
used to express speed in terms of the number of miles traveled in one hour
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The speed limit on this highway is 65 miles per hour.
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I was driving at 80 miles per hour on the freeway.
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I was cruising at 70 miles per hour down the highway.
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His mind was racing a million miles per hour with ideas.