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horsepower.

Power derived from the motion of a horse.

10 characters4 syllables approx.English language

Meaning & usage

noun/ˈhɔɹsˌpaʊɚ/General-American/ˈhɔːsˌpaʊə/Received-Pronunciation
  1. Power derived from the motion of a horse.

    literally · uncountable
  2. A nonmetric unit of power with various definitions, commonly the mechanical horsepower, approximately equal to 745.7 watts.

    countable · uncountable
  3. Metric horsepower, a metric unit approximately equal to 735.5 watts.

    countable · uncountable
  4. Strength, performance capability, specs, or similar.

    figuratively · uncountable
    political horsepower
Where this word comes from

From horse + power: the unit was originally defined as the amount of power that a horse could provide. Both non-metric and metric units of power were derived from effectively identical measurements of the power a draught horse could sustain over several hours, with the difference in watts solely due to different rounding errors to express that power in round numbers in the original non-SI units (ft·lbf/min and kgf⋅m/s respectively).

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.