| Autotrophie | autotrophy |
| Autographie | autography |
| autotroph | autotroph |
| Abiotrophie | abiotrophy |
| Autoskopie | autolaryngoscopy autoscopy |
| Autotomie | autotomy |
| Autotypie | autotypy |
| Allotropie | allotropy |
| auxotroph | auxotrophic |
| Atrophie | atrophy |
| Autograph | autograph |
| Autoerotik | autoerotism |
| Autografie | autography |
| Autokarpie | autocarpy |
| Autokratie | autocracy |
| Autonomie | autonomy |
| Autopsie | autopsy |
| Autotherapie | autotherapy |
| Autotoxin | autotoxin |
| Anisotropie | anisotropy |