Word.ws English Dictionary

a.u.

a.u. is the abbreviation of atomic units.

a.u. is the abbreviation of arbitrary units.

a.u. is the abbreviation of astronomical units.

a.u. is the abbreviation of absorbance units.

Noun capitalized: A.U.

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

  1. (alternative) Alternative form of AU.

Forms of a.u.

plurala.u.s
pluralA.U.'s
alternative formAU
alternative formA. U.

Questions about a.u.

What is a.u. the abbreviation of?
A.u. is the abbreviation of atomic units.
What part of speech is a.u.?
A.u. is a noun.
What is the plural of a.u.?
The plural of a.u. is a.u.s.

Words near a.u. in the dictionary

  1. A.R.
  2. A.R.E.
  3. a.s.
  4. A.S.I.
  5. A.S.L.E.F.
  6. a.u.
  7. A.U.'s
  8. a.u.s
  9. A.U.S.A.
  10. A.U.S.A.s
  11. A/3C

Source and license

Adapted from Wiktionary: a.u. (page history and authors); A.U. (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated:

Cite this entry: “a.u..” Word.ws, https://word.ws/a.u.. Based on Wiktionary, CC BY-SA 4.0.