Standard Lemma guide

watt-hour

noun · 2 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

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1

noun

Meaning 1

A unit of electrical energy equal to the power of one watt in use for one hour; often used as a unit of electricity consumption. It is equal to 3600 joules.

Definition source: English Wiktionary via Wiktextract

Examples

  • Holonyms: kilowatt-hour < megawatt-hour < gigawatt-hour < terawatt-hour
  • Meronym: milliwatt-hour

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

a unit of energy equal to the power of one watt operating for one hour

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: work unit, heat unit, energy unit

History

Etymology

From watt + hour.

Across languages

Translations

7 source translations are retained for this English entry.

  • Bulgarian: ва́тча́с (vátčás) — unit of electrical energy equal to the power of one watt in use for one hour
  • Czech: watthodina — unit of electrical energy equal to the power of one watt in use for one hour
  • Finnish: wattitunti — unit of electrical energy equal to the power of one watt in use for one hour
  • French: wattheure — unit of electrical energy equal to the power of one watt in use for one hour
  • German: Wattstunde — unit of electrical energy equal to the power of one watt in use for one hour
  • Greek: βατώρα (vatóra) — unit of electrical energy equal to the power of one watt in use for one hour
  • Irish: vatuair — unit of electrical energy equal to the power of one watt in use for one hour