Attojoule

noun

noun ·Rare ·Advanced level

Definitions

Noun

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

Synonyms

Etymology

From atto- + joule.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.