AA

Symbol.
1.
a proportional shoe width size, narrower than A and wider than AAA.
2.
the smallest proportional brassiere cup size.
3.
a quality rating for a corporate or municipal bond, lower than AAA and higher than A.
4.
Electricity. a battery size for 1.5 volt dry cells: diameter, 0.6 inches (1.4 cm); length, 2 inches (5 cm).
5.
British. a designation for motion pictures certified as unsuitable for children under 14 unless accompanied by an adult. Compare A ( def 11 ), U ( def 5 ), X ( def 9 ).

a̅a̅

Symbol.
(in prescriptions) ana2.
Also, āa.


Origin:
< Greek aná, with superscript bar representing the nasal consonant

A.A.

3.
antiaircraft artillery.
4.
Associate in Accounting.

a.a.

Also, aa.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
a', aa or aw (ɔː)
 
determiner
(Scot) variants of all
 
aa, aa or aw
 
determiner
 
aw, aa or aw
 
determiner

aa1 (ˈɑːɑː)
 
n
a volcanic rock consisting of angular blocks of lava with a very rough surface
 
[Hawaiian]

aa2
 
abbreviation for
ana1

AA
 
abbreviation for
1.  Alcoholics Anonymous
2.  anti-aircraft
3.  Architectural Association
4.  (in Britain) Automobile Association
5.  (in Britain) Advertising Association
 
symbol for
6.  (in Britain, formerly) a film that may not be shown publicly to a child under fourteen

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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American Heritage
Medical Dictionary

AA abbr.

  1. Alcoholics Anonymous

  2. amino acid

  3. aminoacyl

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
American Heritage
Science Dictionary
aa   (ä'ä)  Pronunciation Key 
A type of lava having a rough, jagged surface. It is relatively slow moving in its molten state, advancing in the form of massive blocks with fissured and angular surfaces that ride on a viscous interior. The blocks range in size between the size of a football and the size of a house. See Note at pahoehoe.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
American Heritage
Abbreviations & Acronyms
aa
  1. Afar (language)

  2. author's alteration

AA
  1. Academy of Aphasia

  2. Acts of the Apostles

  3. administrative assistant

  4. adverse action

  5. Alcoa Inc.

  6. Alcoholics Anonymous

  7. Alzheimer's Association

  8. antiaircraft

  9. Armed Forces Americas (except Canada)

  10. Associate in Arts

  11. atomic absorption

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
Cite This Source
Example sentences for aa
They are funded by local members and responsible to the aa groups they represent.
Aa promotes the idea that recovery from alcoholism entails more than not drinking.
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