| 1. | Alcoholics Anonymous. |
| 2. | antiaircraft. |
| 3. | antiaircraft artillery. |
| 4. | Associate in Accounting. |
| 5. | Associate of Arts. |
| 6. | author's alteration. |
| an organization of alcoholics whose purpose is to stay sober and help others recover from the disease of alcoholism. Abbreviation: AA, A.A. |
| a degree granted esp. by junior colleges after completion of two years of study. Abbreviation: A.A. |
| a correction or change made in typeset copy that is not a correction of an error introduced by the compositor. Abbreviation: AA, A.A., a.a., aa |