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A.A.

3.
antiaircraft artillery.
4.
Associate in Accounting.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Word Origin and History for a. a.

A.A.

also AA, abbreviation of Alcoholics Anonymous, attested by 1941, American English. The group name was the title of a book published in 1938 by the founder, Bill W.

Online Etymology Dictionary, © 2010 Douglas Harper
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