horsepower

noun

horse·​pow·​er ˈhȯrs-ˌpau̇(-ə)r 

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

Synonyms of horsepower

• power
• energy
• strength
• muscle

Examples of horsepower in a Sentence

an engine with 200 horsepower

that architectural firm probably doesn't have the creative horsepower to produce a truly innovative design

Recent Examples on the Web

Both front and rear are electronically controlled, resulting in around 93 horsepower of peak hybrid power from its all-wheel-drive system. —New Atlas, 4 Mar. 2026

Nevertheless, the vessel in the picture does not fit the definition of a speedboat, which typically have multiple higher-horsepower engines. —David Goodhue, Miami Herald, 3 Mar. 2026

Toto Wolff, the Mercedes team principal, suggested the possible advantage was only worth a few horsepower — not the few tenths of a second some rivals had feared — and that other teams were potentially looking for excuses before the season had even started. —Luke Smith, New York Times, 28 Feb. 2026

Hot rodding is always changing, according to Larivee, and the biggest change from those early days involves the horsepower that’s readily available. —Eric D. Lawrence, USA Today, 26 Feb. 2026

Word History

First Known Use

1806, in the meaning defined at sense 1

Phrases Containing horsepower

• shaft horsepower

Rhymes for horsepower

• candlepower
• cauliflower
• overpower
• superpower
• vavasour
• waterpower
• airpower
• brainpower
• devour
• empower
• firepower
• manpower

Kids Definition

horsepower

noun

horse·​pow·​er ˈhȯr-ˌspau̇(-ə)r 

: a unit of power equal in the U.S. to 746 watts and nearly equal to the English unit of the same name that equals 550 foot-pounds of work per second