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Agricultural Adjustment Administration.
Amateur Athletic Association.
American Automobile Association.
antiaircraft artillery.
Automobile Association of America.
a proportional shoe width size, narrower than AA.
the highest quality rating for a corporate or municipal bond.
Electricity. a battery size for 1.5 volt dry cells: diameter, 0.4 inches (1 cm); length 1.7 inches (4.3 cm).
Amateur Athletic Association.
American Automobile Association.
Automobile Association of America.
Contemporary Examples

But if one of the major ratings agencies says the U.S. is no longer AAA and a recession looms, what will happen to the U.S. debt?
The U.S. Credit Rating Might Get Downgraded Again, But Does Anyone Care? Matthew Zeitlin November 13, 2012

France is now widely considered next in line after the U.S. to lose its AAA bond rating.
Debt Crisis Lessons for Europe Stefan Theil August 18, 2011

Meanwhile, four U.S. companies maintain a AAA rating, and therefore, rank higher than the United States in credit-worthiness.
Where the U.S. Ranks On Credit August 9, 2011

It has warned that it will lower the U.S. credit rating from AAA if no deal is reached come Jan. 1.
The U.S. Credit Rating Might Get Downgraded Again, But Does Anyone Care? Matthew Zeitlin November 13, 2012

According to AAA, a year ago the average price for a regular gallon of gas was $3.83; today it is $3.90.
Obama-Republican Fight Over Gas Prices Is Pure Political Theater Zachary Karabell April 17, 2012

Privately, Britain seems to be patting itself on the back for maintaining its own AAA rating.
S&P: Debt Downgrade Analysis Was ‘Objective’ August 6, 2011

It kept its AAA credit rating; GDP per capita climbed; inflation and unemployment are still low; and the dollar is strong.
Australia Wants to Open the Great Barrier Reef to Dumping Kirsten Alexander June 1, 2014

However, it’s unclear what effect the downgrade will have if the other two rating agencies preserve the government’s AAA rating.
S&P: Debt Downgrade Analysis Was ‘Objective’ August 6, 2011

Historical Examples

It may be loaded with larger shot—say AAA—which is effective up to fifty yards.
Unexplored Spain Abel Chapman

We are in the market for 500 AAA skunk, males and females for breeding purposes.
Fur Farming For Profit Hermon Basil Laymon

abbreviation
(Brit) Amateur Athletic Association
anti-aircraft artillery See also triple A
(US) Automobile Association of America
Automobile Association of Australia
noun

See triple A

also AAA, abbreviation of American Automobile Association, attested 1902, American English, the year the organization was founded.
abdominal aortic aneurysm
American Arbitration Association
antiaircraft artillery
Area Agencies on Aging