| Abbreviation | Definition |
|---|---|
| A2HA | American Association of Hospital Accountants |
| AA | Aluminum Association |
| AAA | American Anthropological Association |
| AAA | American Association of Anatomists |
| AAAA | Ann Arbor Administrators Association |
| AAAAI | American Academy of Allergy, Asthma & Immunology |
| AAAAI | American Academy of Allergy, Asthma and Immunology |
| AAAAI | American Academy of Allergy, Asthma, and Immunology |
| AAAAPSF | American Association for Accreditation of Ambulatory Surgery Facilities |
| AAAASF | American Association for Accreditation of Ambulatory Surgical Facilities |
| AAABEM | American Association of Acupuncture and Bio-Energetic Medicine |
| AAAC | Asian Association for Algorithms and Computation |
| AAADM | American Association for Automatic Door Manufacturers |
| AAADM | American Association of Automatic Door Manufacturers |
| AAAG | American Association of Anthropological Genetics |
| AAAH | Advocates for Asian American Health |
| AAAHC | Accreditation Association for Ambulatory Health Care |
| AAAI | American Academy of Allergy and Immunology |
| AAAJ | Asian Americans Advancing Justice |
| AAAM | American Association of Automotive Medicine |