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R.A.

1.
rear admiral.
2.
Astronomy. right ascension.
3.
royal academician.
4.
Royal Academy.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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R.A.

Royal Academy
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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