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A. A. Michelson
A. A. Milne
A. Conan Doyle
A. E. Burnside
A. E. Housman
A. E. Kennelly
A. E. W. Mason
A. F. of L.
A. K. Erlang
A. Noam Chomsky
A. testudineus
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-- a.u. --
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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.

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