Etymology
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mph

also m.p.h., abbreviation of miles per hour, attested from 1887.

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Definitions of mph

mph (n.)
the ratio of the distance traveled (in miles) to the time spent traveling (in hours);
Synonyms: miles per hour
mph (n.)
a speedometer reading for the momentary rate of travel;
Synonyms: miles per hour
From wordnet.princeton.edu