: the practical meter-kilogram-second unit of electrical potential difference and electromotive force equal to the difference of potential between two points in a conducting wire carrying a constant current of one ampere when the power dissipated between these two points is equal to one watt and equivalent to the potential difference across a resistance of one ohm when one ampere is flowing through it
1
: a leaping movement in fencing to avoid a thrust
2
a
: a tread or gait in which a horse going sideways makes a turn around a center
b
: a circle traced by a horse in this movement

Examples of volt in a Sentence

Recent Examples on the Web
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Noun
The setup operates from a 240-volt supply and was first tested in the workshop before being moved onto a badminton court. Jijo Malayil, Interesting Engineering, 1 Sep. 2026 Drops charged this way have been measured at up to 9,000 volts. Jacek Krywko, ArsTechnica, 31 Aug. 2026 The 800-volt electrical system that supports the chassis tech exists in the Torcal, so its suspension is every bit as responsive as Porsche’s. Byron Hurd, The Drive, 27 Aug. 2026 The 800-volt setup will allow the company the flexibility to offer the SUV with an all-electric or hybrid powertrain. Bryan Hood, Robb Report, 26 Aug. 2026 See All Example Sentences for volt

Word History

Etymology

Noun (1)

Alessandro Volta

Noun (2)

borrowed from French volte, borrowed from Italian volta "turn," noun derivative of voltare "to turn," going back to Vulgar Latin *volvitāre, frequentative of Latin volvere "to set in a circular course, cause to roll, bring round" — more at wallow entry 1

First Known Use

Noun (1)

1873, in the meaning defined above

Noun (2)

1688, in the meaning defined at sense 1

Time Traveler
The first known use of volt was in 1688

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Cite this Entry

“Volt.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/volt. Accessed 2 Sep. 2026.

Kids Definition

volt

noun
ˈvōlt
: a unit of electrical potential difference and electromotive force equal to the difference in potential between two points in a conducting wire carrying a constant current of one ampere when the power used between these two points is equal to one watt

Medical Definition

1
: the practical mks unit of electrical potential difference and electromotive force equal to the difference of potential between two points in a conducting wire carrying a constant current of one ampere when the power dissipated between these two points is equal to one watt and equivalent to the potential difference across a resistance of one ohm when one ampere is flowing through it
2
: a unit of electrical potential difference and electromotive force equal to 1.00034 volts and formerly taken as the standard in the United States

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