| Abbreviation | Definition |
|---|---|
| A2C | Association des agences de communication créative |
| AA | Alumni Association |
| AA | American Association |
| AAA | Afghan Aid Association |
| AAA | Arkansas Activities Association |
| AAAA | African American Alumni Association |
| AAAA | Alamo Area Aquatic Association |
| AAAA | Albuquerque Aerostat Ascension Association |
| AAAA | Alexandria Area Arts Association |
| AAAA | Alps Adria Acoustics Association |
| AAAA | American Association for Affirmative Action |
| AAAA | American Association for the Advancement of Atheism |
| AAAA | American Association of Aardvark Aficionados |
| AAAA | American Association of Advertising Agencies |
| AAAA | Anguilla Amateur Athletic Association |
| AAAA | Antique Advertising Association of America |
| AAAA | Asian Amateur Athletics Association |
| AAAA | Association of Accredited Advertising Agents |
| AAAA | Australian Automotive Aftermarket Association |
| AAAAA | American Association Against Alliteration Abuse |