| AAB | Anglo American Book |
|---|---|
| AACO | AIDS Activities Coordinating Office |
| AAS | Air Assault School |
| AAS | Anglo-American School |
| ABDÓMEN | brucho, zadoček hmyzu (zool.) |
| ABEND | ligand - koordinovaná skupina molekúl |
| ABERÁCIA | poddruhová systematická jednotka (zool.) |
| ABP | Address Book Provider |
| ABS | Adult Book Store |
| ACARI | roztoče (zool.) |