Meaning

noun English poet and theologian (1674-1748)

noun a unit of power equal to 1 joule per second; the power dissipated by a current of 1 ampere flowing across a resistance of 1 ohm

noun Scottish engineer and inventor whose improvements in the steam engine led to its wide use in industry (1736-1819)

originPatronymic surname from the Middle English given name Wat, derived from Walter, equivalent to Watt + -s.

Etymology from Wiktionary, CC BY-SA 3.0