| AAR | active avoidance reaction; acute articular rheumatism; antigen-antiglobulin reaction |
|---|---|
| aar | against all risks |
| AARE | automobile accident, rear end |
| AAROM | active assertive range of motion; active-assisted range of motion |
| AARP | American Association of Retired Persons |
| AART | American Association for Rehabilitation Therapy; American Association for Respiratory Therapy |