| Autoantonym | contranym |
| autonom | autonomous self-governed |
| Antagonym | contranym |
| Antonym | antonym |
| Autokolonne | motorcade |
| Autoatlas | road atlas |
| Autochrom | autochrome |
| Autochthoner | autochthon |
| Autodrom | motor-racing circuit dodgems track bumper car dodgem |
| Automation | automation |
| Autonomie | autonomy |
| Autosom | autosome |
| Autostopp | hitch-hiking autostop |
| Autotomie | autotomy |
| Autotoxin | autotoxin |
| Autozoom | autozoom |
| autochthon | autochthonous |
| Mutantin | mutant |
| Anthroponym | anthroponym |
| Atlantikum | Atlantic |