au

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

1. A vowel found in Indic abugidas.

   Synonyms: letter au

alternative a.u. · alternative A.U. · alternative A. U.

1. abbreviationinitialismnot comparablehobbiesInitialism of almost uncirculated.

plural AUs · alternative a.u. · alternative A.U. · alternative A. U.

1. abbreviationcountableinitialismuncountabledermatologyInitialism of alopecia universalis.
2. abbreviationcountableinitialismuncountableastronomyInitialism 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.

   2008, BioWare, Mass Effect, Redwood City: Electronic Arts, →ISBN, →OCLC, PC, scene: Tuntau

3. abbreviationcountableinitialismuncountablemetrologyInitialism of angstrom unit.
4. abbreviationcountableinitialismslanguncountablelifestyleInitialism of alternate universe or alternative universe.
5. abbreviationcountableinitialismuncountableInitialism of arbitrary unit.
6. abbreviationcountableinitialismuncountableInitialism of animal unit.

alternative a.u. · alternative A.U. · alternative A. U.

1. abbreviationinitialismInitialism 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.

   2026 September 4, Thomas Mukhwana, Wycliffe Muia, “UN votes to adopt new world map to reflect Africa's true size”, in BBC News, retrieved 04 Sep 2026

2. abbreviationinitialismInitialism of Age of Ultron.

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

1. A surname.