| Abbreviation | Definition |
|---|---|
| AARP | Association of Anally Rogering People |
| AARR | Average Annual Rate of Reduction |
| AARS | Academic Advising and Retention Services |
| AARS | Advocating Against Romance Scammers |
| AARS | Alabama Association of Rescue Squads |
| AARS | All America Rose Selections |
| AARS | All American Rose Selection |
| AARS | American Acne and Rosacea Society |
| AARS | Approximate Analogical Reasoning Scheme |
| AARS | Asian American Recovery Services |
| AARS | Asian Association on Remote Sensing |
| AARS | Austin Amateur Radio Supply |
| AARS | Automated Aerial Refueling System |
| AARSC | Aerodynamically Actuated Radical Shape Change |
| AART | Age Appropriate Reading Text |
| AART | All Ages Read Together |
| AART | Automatic Adjustment of Retention Times |
| AARTO | Administrative Adjudicated of Road Traffic Offences |
| AARTO | Administrative Adjudication of Road Traffic Offences |
| AAS | Acta Apostolicae Sedis |