noun
nominal horsepower
Technical term used in engineering and machinery specifications to denote the rated or nameplate horsepower of an engine or motor.
このエンジンの公称馬力は100馬力です。
The nominal horsepower of this engine is 100 horsepower.
馬力 is the general term for horsepower, while 公称馬力 specifically refers to the nominal or rated horsepower as stated by the manufacturer.
Compound of 公称 (kōshō, 'nominal, public designation') and 馬力 (bariki, 'horsepower').