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Wordnet 3.0

NOUN (2)

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]


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]
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]
V.E.R.A. -- Virtual Entity of Relevant Acronyms (September 2014):

AU Access Unit
The Free On-line Dictionary of Computing (18 March 2015):

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