| Abbreviation | Definition |
|---|---|
| ACAM | Airborne Compact Atmospheric Mapper |
| ACFB | Atmospheric Circulating Fluidized Bed |
| ACU | Atmospheric Control Unit |
| ACVE | Atmospheric Composition Validation and Evolution |
| ADDD | Atmospheric Double Drum Dryers |
| AEP | Atmosphere Entry Program |
| AHG | Atmospheric High Gravity |
| AIRS | Atmospheric Infrared Radiometer Sounder |
| ALOHA | Aerial Locations of Hazardous Atmospheres |
| ALOHA | Areal Locations Of Hazardous Atmospheres |
| AMCE | Atmospheric Marine and Coastal Environment |
| AMT | Atmospheric Measurement Techniques |
| AOCS | Atmospheric Optical Calibration System |
| AOGCM | Atmosphere Ocean Global Circulation Models |
| AOH | Atmosphere Of Heaven |
| AOK | Atmosphere of Kindness |
| AOM | Atmosphere Ocean Model |
| APCP | Atmospheric pressure cold plasma |
| APGC | Atmospheric Pressure Gas Chromatography |
| APIMS | Atmospheric Pressure Ionisation Mass Spectrometer |