| Abbreviation | Definition |
|---|---|
| AAR | After Action Review |
| AARL | Aeronautical and Astronautical Research Laboratory |
| AAV | Aerospace Audio- Visual |
| AAV | Air Admittance Valve |
| ABA | Astronaut Boarding Aircraft |
| ABC | Active Body Control |
| ABC | Audio Bus Coupler |
| ABCL | As Built Configuration List |
| ABE | Anomalous Biological Entities |
| ABHRS | As Built Hardware Reporting System |
| ABOLT | Acquire Bolt |
| ABS | Anti Burn Shield |
| ABT | Approximate Burn Time |
| ABUP | Auxiliary Back- Up Plate |
| ABUP | Auxiliary Back-Up Plate |
| ABV | Above |
| AC | Aerodynamic Center |
| AC | Alternating Current |
| AC | Assembly Complete |
| AC | Comptroller Office |