| Abbreviation | Definition |
|---|---|
| ADD | After Death Disciples |
| ADD | Astral Destruction Dragon |
| ADE | After Death Experience |
| ADN | Alliance Defense Network |
| ADOM | Ancient Dungeons Of Mystery |
| ADR | Agent D Reaper |
| ADRIAN | Artificial Device Responsible for Infiltration and Accurate Nullification |
| AE | After Earth |
| AE | Anime Essentials |
| AEGIS | Alien Exterminating Global Intercept System |
| AEGIS | Alien Extermination Global Intercept System |
| AES | Allied Electronic Simulations |
| AESA | Advanced Emotionally Sensitive Android |
| AEST | Autonomous Environmental Sensor for Telepresence |
| AF | After Life |
| AF | Alpha Federation |
| AF | Alternate Future |
| AF | Alternative Future |
| AF | Anarchist Federation |
| AF | Axis Future |