| Acronym | Meaning |
 | ATLID | Atmospheric LIDAR |
| ATM | Apollo Telescope Mount |
| ATM | Division Of Atmospheric Sciences |
| ATM | Adobe Type Manager |
| ATM | Asynchronous Transfer Mode |
| ATMOS | Atmospheric Trace Molecules Observed By Spectroscopy |
| ATMS | Advanced Traffic Management System |
| ATOG | Abnormal Test Procedure Operator Guidelines |
| ATR | Attenuated Total Reflection |
| ATR | Alliance For Transportation Research |
| ATRAD | Detailed Atmospheric Radiation Model |
| ATRAP | Alliance For Transportation Research |
| ATRMD | Air |
| ATS | Advanced Technology Satellite |
| ATS | Application Technology Satellite |
| ATS | Accelerator Test Stand |
| ATSD | Assistant To The Secretary Of Defense |
| ATSDR | Agency For Toxic Substances And Disease Registry |
| ATSR | Argonne Thermal Source Reactor |
| ATSR | Along Track Scanning Radiometer |
| ATST | Advanced Technology Solar Telescope |
| ATSU | Accelerator Test Stand Upgrade |
| ATV | Ariane Transfer Vehicle |
| AU | Astronomical Unit |
| AURA | Association Of Universities For Research In Astronomy |
| AUSPEX | Atmospheric Utility Signatures-Predictions And Experiments |
| AVARS | Aircraft Vertical Accelerometer Reports |
| AVC | Advanced Vector Computer |
| AVC | Automatic Volume Control |
| AVCS | Advanced Vidicon Camera Service |
| AVE | Atmospheric Variability Experiment |
| AVHRR | Advanced Very High Resolution Radiometer |
| AVIRIS | Airborne Visible And Infared Imaging Spectrometer |
| AVMA | Automotive Vehicle Manufacturers Association |
| AVN | Aviation Model At NCEP |
| AVS | Application Visualization System |
| AVS EXPRESS | Upgraded Version Of The Application Visualization System |
| AW | Annual Worth |
| AWACS | Airborne Warning And Control System |
| AWC | Aviation Weather Center |
| AWC | Association Of Women In Computing |
| AWDAAS | Automatic Weather Data Acquisition And Archiving System |
| AWDL | Aviation Weather Development Laboratory |
| AWDP | Aviation Weather Development Program |
| AWDS | Automated Weather Distribution System |
| AWE | Atomic Weapons Establishment |
| AWEA | American Wind Energy Association |
| AWES | American Wind Energy Systems |
| AWF | Aging Waste Facility |
| AWFTF | Aviation Weather Forecasting Task Force |
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