watt-hour

noun
\ ˈwät-ˈau̇(-ə)r How to pronounce watt-hour (audio) \

Definition of watt-hour

: a unit of work or energy equivalent to the power of one watt operating for one hour

First Known Use of watt-hour

1888, in the meaning defined above

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The first known use of watt-hour was in 1888

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