| Abbreviation | Definition |
|---|---|
| AASS | alpha aminoadipic semialdehyde synthase |
| AASS | Aminoadipate Semialdehyde Synthase |
| AASS | Applied Autonomous Sensor Systems |
| AAST | Autumn Art Studios Tour |
| AASU | Arise and Shine Uganda |
| AASU | Armstrong |
| AASW | Animal Assisted Social Work |
| AASW | Armenian Association of Social Workers |
| AASW | Australian Association of Social Workers |
| AASWHAT | AaS What |
| AASWHAT | AaS – What |
| AASWHAT | AaS ??? What |
| AASWHAT | AAS What's |
| AAT | Able Applied Technologies |
| AAT | achen Aphasia Test |
| AAT | Advanced Analytical Technologies |
| AAT | Alignment Assignment and Technique |
| AAT | American Accent Training |
| AAT | American Assets Trust |
| AAT | Apple Advanced Typography |