| Autotropismus | autotropism |
| Autoerotismus | autoeroticism autoerotism |
| Automatismus | automatism |
| Utopismus | utopianism |
| autotypisch | autotypic |
| Autismus | autism |
| Autocross | autocross |
| Automobilismus | automobilism |
| Autoritarismus | authoritarianism |
| Autotrophie | autotrophy |
| autoerotisch | autoerotic |
| autotroph | autotroph |
| Totemismus | totemism |
| Thermotropismus | thermotropism |
| Antiterrorismus | antiterrorism |
| Antitheismus | antitheism |
| Radtourismus | bicycle touring |
| Titoismus | Titoism |
| Toryismus | Toryism |
| Aktionismus | actionism |