| Abbreviation | Definition |
|---|---|
| ABRAPA | Brasilianischer Deutschlehrerverband |
| ABRAPA | Brazilian Association of Associations of Professors of German |
| ABRC | Association des Bibliothèques de Recherche du Canada |
| ABRC | Association des Bibliothques de Recherche du Canada |
| ABRC | Canadian Association of Research Libraries |
| ABRH | Associação Brasileira de Recursos Hídricos |
| ABRH | Associao Brasileira de Recursos Hdricos |
| ABRH | Brazilian Association for Water Resources |
| ABS | American Bladesmith Society |
| ABS | American Bonanza Society |
| ABS | American Brachytherapy Society |
| ABS | Animal Behaviour Society |
| ABSC | Association des Bibliothques de la Sant du Canada |
| ABSC | Canadian Health Libraries Association |
| ABU | Association of World-Wide Bibliophiles |
| AC | Accademia del Cimento |
| AC | Accademia della Crusca |
| ACA | Association Canadienne d'Archéologie |
| ACA | Association Canadienne d'Archologie |
| ACA | Canadian Archaeological Association |