AU

See also: Appendix:Variations of "au"

㍳ U+3373, ㍳ SQUARE AU ← ㍲ [U+3372] CJK Compatibility ㍴ → [U+3374]

Translingual

Symbol

AU

1. The ISO 3166-1 two-letter (alpha-2) code for Australia.
2. astronomical unit

Usage notes

(astronomical unit): Though "AU" is in frequent use by professional bodies and the public, the unit symbol au is recommended by the IAU and ua by the BIPM.

Synonyms

(astronomical unit):

• au (the IAU recommended unit symbol for astronomical units)
• ua (the BIPM recommended unit symbol for astronomical units)
• ㍳ (Unicode glyph for astronomical unit)

Anagrams

• UA

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English

Alternative forms

• a.u., A.U., A. U.

Noun

AU (plural AUs)

1. (medicine, dermatology) Initialism of alopecia universalis.
2. (astronomy) Initialism of astronomical unit.
   • 2008, BioWare, Mass Effect, Redwood City: Electronic Arts, →ISBN, OCLC 246633669, PC, scene: Tuntau:

     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. Initialism of angstrom unit.
4. (fandom slang) Initialism of alternate universe.
5. Initialism of arbitrary unit.

Proper noun

AU

1. Initialism of African Union.

Anagrams

• U/A, UA, uA