| Abbreviation | Definition |
|---|---|
| AD | Aperture Door |
| AD | Attachment Device |
| ADACS | Attitude Determination And Control Subsystem |
| ADAES | Advanced Data Assessment Expert System |
| ADAMS | Airborne Data Acquisition and Management System |
| ADC | Aerospace Development Center |
| ADC | Affiliated Data Center |
| ADC | Analog to Digital Converter |
| ADEOS | Advanced Earth Observing Mission |
| ADEPT | Alexandria Digital Earth Modeling System |
| ADF | Air Diffuser |
| ADIS | NASA Aviation Data Integration System |
| ADL | Audio Development Laboratory |
| ADMT | Air Distributed Mission Trainer |
| ADN | Adept Dlese Nasa |
| ADP | Acceptance Data Package |
| ADP | Automated Data Processing |
| ADPS | Acceptance Data Package System |
| ADS | Attitude Determination System |
| ADSF | Advanced Directional Solidification Furnace |