| AOA | American Osteopathic Association; Administration on Aging; Alpha Omega Alpha Honor Society; American Optometric Association; American Orthopedic Association; American Orthopsychiatric Association; |
|---|---|
| AOAA | amino-oxyacetic acid |
| AOAC | Association of Official Agricultural Chemists |
| AOAP | as often as possible |
| AoArE | aortic arch epinephrine |
| AOAS | American Osteopathic Academy of Sclerotherapy |