| AAC | Airborne Aircraft Controller |
|---|---|
| AAN | Airborne Aircraft Controller |
| AAS | Alert Area Supervisor |
| AAS | Austrian Atherosclerosis Society |
| ABA | arabská pelerína |
| ABS | Automatic Brightness Stabilization controller (skr.) |
| ADAMI | taliansky maliar (Valerio, *1935) |
| ADC | Air Direction Controller |
| ADP | Acoustic Doppler Profiler |
| AERIUS | protialergický liek |