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au

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au¹

noun au

  1. abbreviation Abbreviation of atomic unit
  2. abbreviation Abbreviation of arbitrary unit
  3. abbreviation Abbreviation of astronomical unit
  4. abbreviation Abbreviation of Absorbance Units

noun

  1. A vowel found in Indic abugidas.

    Similar: letter au

AU²

adjective a.u. · A.U. · A. U.

  1. abbreviation, initialism, not comparable Initialism of almost uncirculated

noun AUs · a.u. · A.U. · A. U.

  1. abbreviation, countable, initialism, uncountable Initialism of alopecia universalis
  2. abbreviation, countable, initialism, uncountable Initialism of astronomical unit Tuntau is an enormous, low-density terrestrial planet, with a thick atmosphere of methane and helium. Despite being nearly 20 AU from Phoenix, the star's great heat and the insulating thickness of the atmosphere make the surface surprisingly temperate.
  3. abbreviation, countable, initialism, uncountable Initialism of angstrom unit
  4. abbreviation, countable, initialism, slang, uncountable Initialism of alternate universe or alternative universe
  5. abbreviation, countable, initialism, uncountable Initialism of arbitrary unit
  6. abbreviation, countable, initialism, uncountable Initialism of animal unit

proper noun a.u. · A.U. · A. U.

  1. abbreviation, initialism Initialism of African Union The "Correct the Map" resolution, sponsored by Togo and backed by African Union (AU) members, passed with the support of 164 nations, including France and the UK.
  2. abbreviation, initialism Initialism of Age of Ultron

Au³

proper noun

  1. A language spoken in Sandaun Province, Papua New Guinea.

Au⁴

Where it comes from

Borrowed from Cantonese 歐／欧 (ou1) or 區／区 (ou1) (Doublet of Ao), or from German Au.

proper noun

  1. A surname.

Thesaurus

Closest in meaning: astronomical unit, gold, ag, matelot, feu, bac, lait, recollet, contraire, perche, moine, aurum, golden, aureate, auric, aurous

Translations

Every language

adj almost uncirculated

FrançaisSPL

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Cite this
MLA

"au." Wiktionary, via Micwyn, micwyn.com/word/au. Accessed 6 Nov. 2026.

APA

au. (n.d.). In Wiktionary, via Micwyn. Retrieved November 6, 2026, from https://micwyn.com/word/au

Chicago

"au." Wiktionary, via Micwyn. Accessed November 6, 2026. https://micwyn.com/word/au.

BibTeX
@misc{au_2026,
  title = {au},
  howpublished = {Wiktionary, via Micwyn},
  year = {2026},
  url = {https://micwyn.com/word/au},
  urldate = {2026-11-06}
}