| Automation | automation |
| Automatik | automatism automatic automatic transmission |
| Autofiktion | autofiction |
| Automat | vending machine |
| Autoradio | car radio automobile radio |
| Autorisation | authorisation authorization |
| Autoxidation | autoxidation |
| autochthon | autochthonous |
| automatisch | automatic automatically |
| Animation | animation |
| Annotation | annotation |
| Abrogation | abrogation |
| Adoration | adoration |
| Allokation | allocation |
| Detonation | detonation |
| Guttation | guttation |
| Intonation | intonation |
| Mutation | mutation |
| Mutilation | mutilation |
| Nutation | nutation |