| autoritär | authoritarian |
| Autorität | authority |
| Autoritarismus | authoritarianism |
| Autocar | bus |
| Autoerotik | autoerotism |
| Autorin | author writer |
| Autositz | car seat |
| autoritativ | authoritative |
| Tutorial | tutorial |
| Notorität | notoriety |
| auktorial | auctorial |
| Alterität | alterity |
| Austerität | austerity |
| autorisiert | authorized |
| Autoabgas | car exhaust |
| Autoatlas | road atlas |
| Autodidakt | autodidact |
| Autodieb | car thief |
| Autogiro | autogyro autogiro |
| Autograf | autograph |