attojoule

A1T1T1O1J8O1U1L1E1

noun

An SI unit of energy, work, and heat equal to 10⁻¹⁸ joules. Symbol: aJ

Similar
aJ
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Meanings

nounattojoule (plural attojoules)

plural attojoules

  1. metrologyAn SI unit of energy, work, and heat equal to 10⁻¹⁸ joules. Symbol: aJ

    Synonyms: aJ

Synonyms & antonyms

nounAn SI unit of energy, work, and heat equal to 10⁻¹⁸ joules. Symbol: aJ

Similar
aJ

Origin

From atto- + joule.

Full word history & related roots →
Cite this entry
APA

attojoule. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/attojoule

MLA

“attojoule.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/attojoule. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “attojoule,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/attojoule.

Source: attojoule on Wiktionary, CC BY-SA 4.0.