| ACI | alliance Cooperative Internationale (skr.) |
|---|---|
| AEIF | European Association for Railway Interoperability (skr.), Európska asociácia pre interoperabilitu železníc (angl.skr.) |
| ALEKO | Rachmaninovova opera, opera S. Rachmaninova |
| AOS | Advanced Operating System (skr.) |
| APEC | asian-pacific economic cooperation (skr.) |
| APEC | Asian-Pacific Economic Cooperation, Ázijsko-tichomorská spolupráca (angl.skr.) |
| ATTILA | opera G. Verdiho |
| CARMEN | opera G. Bizeta |
| DALIBOR | opera B. Smetanu |
| DEBORA | opera J. B. Foerstra |