Science Dictionary
astronomical unit  [%PREMIUM_LINK%]     (ās'trə-nŏm'ĭ-kəl)  Pronunciation Key 
A unit of length equal to the average distance from Earth to the Sun, approximately 149.6 million km (92.8 million mi). It is used especially to measure distances within the solar system. Compare light-year, parsec.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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