/ Dictionary / Index W watt: Meaning and Definition of Find definitions for: watt Pronunciation: (wot), [key] the SI unit of power, equivalent to one joule per second and equal to the power in a circuit in which a current of one ampere flows across a potential difference of one volt. Abbr.: W, w. Watt Pronunciation: (wot), [key] — n. 1736–1819, Scottish engineer and inventor. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: watt (Thesaurus) Watson-Wentworth wattage Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language