n.
Pronunciation: ' ho ̇ rs- ˌ pau ̇ (- ə )r
Function: noun
Date: 1806
1 : the power that a horse exerts in pulling
2 : a unit of power equal in the U.S. to 746 watts and nearly equivalent to the English gravitational unit of the same name that equals 550 foot-pounds of work per second
3 : effective power <intellectual horsepower > <computing horsepower >