| Term | Definition | Contributor | Modified |
|---|---|---|---|
| Amateur astronomy | The astronomical activities carried out by amateur astronomers. | Ryan McGranaghan | 2023.04.16 |
| Amateur journalism | No definition provided | Christopher Rauch | 2023.12.01 |
| Amateur theatricals | No definition provided | Christopher Rauch | 2023.12.01 |
| Amaurosis | No definition provided | Christopher Rauch | 2023.12.01 |
| Amaurosis, Feigned | No definition provided | Christopher Rauch | 2023.12.01 |
| Amazonite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Amazons | No definition provided | Christopher Rauch | 2023.12.01 |
| Amazon (Ship) | No definition provided | Christopher Rauch | 2023.12.01 |
| Amazonstone | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Ambassadors | No definition provided | Christopher Rauch | 2023.12.01 |
| Ambassadors: Consuls | No definition provided | Christopher Rauch | 2023.12.01 |
| Amber | No definition provided | Christopher Rauch | 2023.12.01 |
| Amber | No definition provided | Ryan McGranaghan | 2023.04.16 |
| ambient | No definition provided | Ryan McGranaghan | 2023.04.16 |
| ambient air quality standard | No definition provided | Ryan McGranaghan | 2023.04.16 |
| ambient noise | No definition provided | Ryan McGranaghan | 2023.04.16 |
| ambient solar wind | the outflow of the Sun's ionized atmosphere into interplanetary space | Ryan McGranaghan | 2023.04.16 |
| ambient solar wind | the undisturbed outflow of the Sun's ionized atmosphere into interplanetary space | Ryan McGranaghan | 2023.04.16 |
| Amblygonite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Amblyopia | No definition provided | Christopher Rauch | 2023.12.01 |