| autochthon | autochthonous |
| Autochthoner | autochthon |
| allochthon | allochthonous |
| parautochthon | parautochthonous |
| Autochrom | autochrome |
| Automation | automation |
| Autofiktion | autofiction |
| Autobahn | motorway freeway highway interstate highway |
| auxochrom | auxochromic |
| Gutachten | expert opinion expert report report statement |
| Autistin | autist |
| Autoantonym | contranym |
| Häutchen | membrane |
| Autoatlas | road atlas |
| Autocar | bus |
| Autocross | autocross |
| Autocue | autocue |
| Autodiebin | car thief |
| Autodrom | motor-racing circuit dodgems track bumper car dodgem |
| Autoerotik | autoerotism |