| Abbreviation | Definition |
|---|---|
| AAR | After Action Reports |
| AAR | After Action Request |
| AAR | alkali aggregate reaction |
| AAR | All About Romance |
| AAR | Allen Aircraft and Radio |
| AAR | Annual Accreditation Report |
| AAR | Area at Risk |
| AAR | Arizona Association of REALTORS |
| AAR | Armed American Radio |
| AAR | Association for Automated Reasoning |
| AAR | Association Of Alexandria Radiologists |
| AAR | Association of Authors' Representatives |
| AAR | Attendee Acquisition Roundtable |
| AAR | Average Annual Rainfall |
| AAR | Average Annual Return |
| AARA | Access Arrangements and Reasonable Adjustments |
| AARA | Air To Air Refueling Area |
| AARA | Albany Amateur Radio Association |
| AARA | Allied Auto Racing Association |
| AARA | Amsterdam Antwerp Rotterdam Area |