1. Noun.  (astronomy) (initialism of, astronomical unit) .
  2. Noun.  (initialism of, angstrom unit) .
  3. Noun.  (context, fandom) (initialism of, alternate universe) .
  4. Proper noun.  (initialism of, African Union) .

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This entry was last updated on RefTopia from its source on 3/20/2012.