horsepower

noun

1. the power exerted by a horse in pulling
2. pl. horsepower a basic unit of power in the FPS system, equal to the power needed to raise a weight of 550 pounds a distance of 1 foot in 1 second or a weight of 33,000 pounds a distance of 1 foot in 1 minute (746 watts or 42.41 British thermal units per minute): used esp. for measuring the power of motors or engines: abbrev. hp
3. Informal power: this car doesn't have the horsepower to climb steep hills