There are 2 definitions of mph in English:

mph1

Syllabification: mph
Pronunciation: /ˌemˌpēˈāCH
 
/

abbreviation

Miles per hour.

Definition of mph in:

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Word of the day meretricious
Pronunciation: ˌmɛrɪˈtrɪʃəs
adjective
apparently attractive but having no real value...