/ Dictionary / Index H horsepower: Meaning and Definition of Find definitions for: horse•pow•er Pronunciation: (hôrs'pou"ur), [key] — n. a foot-pound-second unit of power, equivalent to 550 foot-pounds per second, or 745.7 watts. the capacity to achieve or produce; strength or talent: The university's history faculty is noted for its intellectual horsepower. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: horsepower (Thesaurus) horseplayer horsepower-hour Related Content Daily Word Quiz: profiterole Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language