| Abbreviation | Definition |
|---|---|
| AMPR | Aeronautical Manufacturers' Planning Report |
| AMPS | Atmosphere, Magnetosphere, and Plasmas in Space |
| AMPS | Atmospheric Magnetospheric Plasma System |
| AMPTE | Active Magnetospheric Particle Tracer Explorer |
| AMPU | Automated Maneuver Planning Utility |
| AMR | Atlantic Missile Range |
| AMRV | Astronaut Maneuvering Vehicle |
| AMS | Acoustic Measurement System |
| AMS | Actuation Mechanism Subsystem |
| AMS | AMplifier Subsystem |
| AMS | Automatic Maintenance Scheduler |
| AMSU | Advanced Microwave Sounding Unit |
| AN | Analog |
| ANDC | Annual NASA Design Competition |
| ANDE | Atmospheric Neutral Drag Experiment |
| ANOVA | Analysis Of Variance |
| ANSA | American National Space Administration |
| ANTS | Antenna Subsystem |
| AO | Assembly Order |
| AO | Atomic Oxygen |