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astronomical unit definition

astronomical unit

Astron. a unit of length based on the mean distance of the earth from the sun, c. 149.6 million km (c. 93 million mi): light travels this distance in c. 8.3 minutes: abbrev. AU

Webster's New World College Dictionary Copyright © 2005 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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