| Abbreviation | Definition |
|---|---|
| AACPO | Affirmative Action and Compliance Programs Office |
| AACR | Anglo American Cataloging Rules |
| AACR | Anglo-American Cataloguing Rules |
| AACR | Animal Assisted Crisis Response |
| AACR | Automated Analysis of Constructed Response |
| AACR | Autoritatea Aeronautica Civila Româna |
| AACS | Advanced Access Content Systems |
| AACS | Airways and Air Communications Service |
| AACS | Annual Admin Code Supplement |
| AACS | Attitude and Articulation Control Subsystem |
| AACS | Attitude and Articulation Control Subsystems |
| AACT | Actively Aerated Castings Tea |
| AACT | Actively Aerated Compost Tea |
| AACT | Adult Anxiety Clinic of Temple |
| AACT | Aeronautics Astronautics CubeSat Team |
| AACT | Aisin Automotive Casting Tennessee |
| AACT | ARM ASR Coordination Team |
| AACT | Automaticity Affect Control and Thought |
| AACT | Awareness Against Current Transgressions |
| AACTS | Addiction Action Communautaire Travail Social |