Definition from Wiktionary, the free dictionary
- From horse and power, the unit originally defined as the amount of power that a horse could provide.
- A non-metric unit of power (symbol hp) with various definitions, for different applications. The most common of them is probably the mechanical horsepower, approximately equal to 745.7 watts.
- A metric horsepower (symbol often PS from the German abbreviation), approximately equal to 735.5 watts.
- political horsepower
Derived terms 
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