from The American Heritage® Dictionary of the English Language, 4th Edition

  • abbr. Agricultural Adjustment Administration
  • abbr. Amateur Athletic Association
  • abbr. antiaircraft artillery

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A standard size of dry cell battery smaller than AA.
  • n. The highest level of minor league baseball, often used by extension in other sports to indicate the highest level of minor league play in that sport as well.
  • n. A very narrow shoe size.
  • n. The highest credit rating given by debt analysis agencies such as Standard & Poor's, Moody's, and A.M. Best.
  • Abdominal Aortic Aneurysm
  • Access All Areas, Sony music project
  • Access Approval Authority
  • Accumulated Adjustments Account, in US Federal Income Tax
  • Acquisition Approval Authority
  • Action Awareness Alert
  • Adaptive Array Antenna
  • Administration, Authorization, and Authentication, in software security
  • Advanced Acoustic Array
  • AEGIS Acquisition Agent
  • Aerospace Engineering, Applied Mechanics, and Aviation
  • Agricultural Adjustment Association
  • Air Avenue of Approach
  • Airborne Array Aperture
  • Airborne Assault Area
  • Aircraft Alert Area
  • Airport Airspace Analysis
  • Allied Artists' Association
  • Allocations, Assessments, and Analysis
  • Alternate Assembly Area
  • Amateur Athletic Association
  • American Abstract Artists
  • American Academy of Actuaries
  • American Accounting Association
  • American Ambulance Association
  • American Automobile Association
  • Angle Angle Angle, a geometric proof
  • ANSI Artists of America
  • anti-aircraft artillery
  • Area Agency on Aging
  • Army Audit Agency
  • Aromatic Amino Acid
  • Arrival and Assembly Area
  • Assign Alternate Area
  • Astronaut-Actuated Abort
  • Attitude, Awareness and Accountability, a ski safety program
  • Australian Association of Accountants
  • Australian Automobile Association
  • Authentication, Authorization and Accounting
  • Authorization Accounting Activity
  • Authorized Accounting Activity
  • Automated Airlift Analysis
  • Autoridad de Acueductos y Alcantarillados (Aqueduct and Sewer Authority, Puerto Rico)
  • Awaiting Aircraft Availability

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an aneurysm of the abdominal aorta associated with old age and hypertension


Sorry, no etymologies found.



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  • Strangely, AAA in the baseball sense isn't in Merriam-Webster's Unabridged, or in American Heritage, 5th ed.

    March 15, 2017

  • cycling term for All Ages And Abilities.

    June 27, 2013

  • While proofreading someone else's document, I came across the phrase "a AAA financial guaranty insurer". This phrase, I decided, was correct, and should not be "an AAA...", because in this case AAA is pronounced "triple-A".

    December 3, 2010

  • AAA stands for Amateur Athletic Association. The AAA (now the Amateur Athletic Association of England) is the oldest national governing body for athletics in the world. It was established on the 24th of April 1880. It is sometimes known as the "three As"

    June 20, 2009