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Definition of horsepower noun from the Oxford Advanced American Dictionary

 

horsepower

 noun
noun
NAmE//ˈhɔrsˌpaʊər//
 
[countable, uncountable] (pl. horsepower) (abbreviation hp)
 
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a unit for measuring the power of an engine a powerful car with a 170 horsepower engine
See the Oxford Advanced Learner's Dictionary entry: horsepower