a.u.

Abbreviation of atomic units.

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Meanings

a.u.1

nouna.u. (plural a.u.s)

plural a.u.s

  1. abbreviationAbbreviation of atomic units.
  2. abbreviationAbbreviation of arbitrary units.
  3. abbreviationAbbreviation of astronomical units.
  4. abbreviationAbbreviation of absorbance units.

A.U.2

nounA.U. (plural A.U.'s)

plural A.U.'s · alternative AU · alternative A. U.

  1. alternativeAlternative form of AU.

Synonyms & antonyms

Also see
astronomical unit
Cite this entry
APA

a.u.. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/a.u.

MLA

“a.u..” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/a.u.. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “a.u.,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/a.u..

Source: a.u. on Wiktionary, CC BY-SA 4.0.