| Abbreviation | Definition |
|---|---|
| AAA | alacrimia-achalasia-addisonianism |
| AAA | Ambulance Association of America |
| AAA | American Academy of Addictionology |
| AAA | American Academy of Allergy |
| AAA | American Academy of Audiology |
| AAA | American Acupuncture Association |
| AAA | American Against Abortions |
| AAA | American Allergy Association |
| AAA | AminoAdipic Acid |
| AAA | Androgenic Anabolic Agent |
| AAA | Annual Accountability Agreement |
| AAA | Anti-Albumin Antibody |
| AAA | Aromatic Amino Acid |
| AAA | Arterio-Arterial Anastomosis |
| AAA | automated amino acid analysis |
| AAACM | All age all cause mortality |
| AAAS | alacrima-achalasia-addisonian syndrome, see Triple A syndrome |
| AAC | acalculous cholecystitis |
| AAC | association cortex |
| AAC | ATP/ADP carrier |