horsepower

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horse·pow·er / ˈhôrsˌpou(-ə)r/ (abbr.: hp) • n. (pl. same) a unit of power equal to 550 foot-pounds per second (745.7 watts). ∎  the power of an engine measured in terms of this: a strong 140-horsepower engine. See also brake horsepower. ∎  power; ability to perform strenuous tasks: other software improvements include more analytical horsepower.

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horsepower (hp) Unit indicating the rate at which work is done, adopted by James Watt in the 18th century. He defined it as the weight, 250kg (550lb), a horse could raise 0.3m (1ft) in one second. The electrical equivalent of 1 hp is 746 watts.

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horsepower an imperial unit of power equal to 550 foot-pounds per second (about 750 watts); the power of an engine measured in terms of this.

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