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horsepower British & World English

An imperial unit of power equal to 550 foot-pounds per second (about 750 watts)

horsepower New Oxford Dictionary for Writers & Editors

(one word; abbreviation h.p.)

brake horsepower British & World English

An imperial unit of power, equal to one horsepower but used only as a measure of the power available at the shaft of an engine

shaft horsepower British & World English

The power delivered to a propeller or turbine shaft

indicated horsepower British & World English

The power produced in a reciprocating engine by the working of the cylinders