| Anti-Utopie | dystopia |
| Antinomie | antinomy |
| Antilope | antelope |
| Antimaterie | antimatter |
| Antipathie | antipathy |
| Anisotropie | anisotropy |
| Antigone | Antigone |
| Antiquarin | antiquarian |
| Antrologie | arthrology |
| Anthologie | anthology |
| Antibiose | antibiosis |
| Antimonit | antimonite stibnite |
| Antipode | antipode |
| Antithese | antithesis |
| antiautoritär | antiauthoritarian |
| Gegenutopie | dystopia |
| Autopsie | autopsy |
| Autoskopie | autolaryngoscopy autoscopy |
| Autotomie | autotomy |
| Autotypie | autotypy |