a.a

A.A.

3.
antiaircraft artillery.
4.
Associate in Accounting.
Dictionary.com Unabridged

a.a.

Also, aa.

Alcoholics Anonymous

noun
an organization of alcoholics whose purpose is to stay sober and help others recover from the disease of alcoholism. Abbreviation: AA, A.A.

Associate of Arts

noun
a degree granted especially by junior colleges after completion of two years of study. Abbreviation: A.A.
Also called associate's degree.

author's alteration

noun
a correction or change made in typeset copy that is not a correction of an error introduced by the compositor. Abbreviation: AA, A.A., a.a., aa
Compare printer's error.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
Alcoholics Anonymous
 
n
an association of alcoholics who try, esp by mutual assistance, to overcome alcoholism

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

A.A.
abbreviation of Alcoholics Anonymous, attested by 1941, Amer.Eng. 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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