horsepower horse post • horsepower-hour · · · Info · Definitions · Synonyms · Characters · · horsepower · · Text Latin · · Script 10 · · Length 4 · · Syllables Definitions · · · (noun) a unit of power equal to 746 watts. Synonyms: HP, H.P.. · · Noun Definition 1 Synonyms · · · hp · · Synonym 1 h.p. · · Synonym 2 Characters · · e latin small letter e U+0065 h latin small letter h U+0068 o latin small letter o U+006F p latin small letter p U+0070 r latin small letter r U+0072 s latin small letter s U+0073 w latin small letter w U+0077