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4 definitions found
 for AU
From The Collaborative International Dictionary of English v.0.48 :

  au \a.u.\ n.
     1. (Astron.) the unit of length equal to the mean distance of
        the Earth from the sun, about 93 million miles (150
        million kiometers); -- used almost exclusively in
        astronomy, or to describe astronomical distances.
  
     Syn: astronomical unit, AU, A.U.
          [WordNet 1.5]

From WordNet (r) 3.0 (2006) :

  Au
      n 1: a soft yellow malleable ductile (trivalent and univalent)
           metallic element; occurs mainly as nuggets in rocks and
           alluvial deposits; does not react with most chemicals but
           is attacked by chlorine and aqua regia [syn: gold, Au,
           atomic number 79]
      2: a unit of length used for distances within the solar system;
         equal to the mean distance between the Earth and the Sun
         (approximately 93 million miles or 150 million kilometers)
         [syn: Astronomical Unit, AU]

From V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016) :

  AU
         Access Unit
         

From The Free On-line Dictionary of Computing (30 December 2018) :

  au
  
     1.  The two character country code for Australia
     used in Internet domain names.
  
     2.  audio.
  
     (1995-02-15)
  

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