noun · 5 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
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General-American:hôrsʹpou'ər
General-American:/ˈhɔɹsˌpaʊɚ/
Received-Pronunciation:hôsʹpou'ə
Received-Pronunciation:/ˈhɔːsˌpaʊə/
US:Recorded audio is listed in the source snapshot.
CMU ARPABET:HH AO1 R S P AW2 ER0
Digits mark lexical stress: 1 primary, 2 secondary, 0 unstressed.
1
noun
Meaning 1
Power derived from the motion of a horse.
Definition source: English Wiktionary via Wiktextract
Usage: literally, uncountable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: none provided
Antonyms: none provided
2
noun
Meaning 2
A nonmetric unit of power with various definitions, commonly the mechanical horsepower, approximately equal to 745.7 watts.
Definition source: English Wiktionary via Wiktextract
Usage: countable, uncountable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: hp
Antonyms: none provided
3
noun
Meaning 3
Metric horsepower, a metric unit approximately equal to 735.5 watts.
Definition source: English Wiktionary via Wiktextract
Usage: countable, uncountable
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: PS
Antonyms: none provided
4
noun
Meaning 4
Strength, performance capability, specs, or similar.
Definition source: English Wiktionary via Wiktextract
Usage: figuratively, uncountable
Examples
political horsepower
Meaning relationships
Synonyms: none provided
Antonyms: none provided
5
noun
Meaning 5
a unit of power equal to 746 watts
Definition source: Princeton WordNet 3.0
No example sentence was provided for this meaning.
Meaning relationships
Synonyms: HP, H.P.
Antonyms: none provided
Broader terms: power unit
History
Etymology
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).
Across languages
Translations
117 source translations are retained for this English entry.