Definition of horsepower noun from the Oxford Advanced Learner's Dictionary

 

horsepower

 noun
noun
BrE BrE//ˈhɔːspaʊə(r)//
 
; NAmE NAmE//ˈhɔːrspaʊər//
 
[countable, uncountable](pl. horsepower)(abbreviation h.p.)
 
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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 American Dictionary entry: horsepower