hp

Noun

horsepower (countable and uncountable, plural horsepowers or horsepower)

1. (literally, uncountable) Power derived from the motion of a horse.
   • Shillibeer's bus came in 1829 drawn by three horses. Later two horses were found sufficient to pull these closed wagonettes, which eventually had outside seats, and later on the substitution of a motor for horsepower.1971, Gwen White, Antique Toys And Their Background, page 86
2. A nonmetric unit of power with various definitions, commonly the mechanical horsepower, approximately equal to 745.7 watts.
   • Equally I can stand in a station like Lucerne in Switzerland, and watch with ill-concealed admiration the majestic entry of one of the latest Gotthard "Ae 6/6" electrics, packing 6,000 horsepower within its 60 ft. of length and 121 tons of weight, with its sleek dark green sides and handsome...1955 April, Cecil J. Allen, “British Locomotive Practice and Performance”, in Railway Magazine, page 261

   Synonyms:

   hp

3. Metric horsepower, a metric unit approximately equal to 735.5 watts.

   Synonyms:

   PS

4. (figuratively, uncountable) Strength, performance capability, specs, or similar.
   • political horsepower