| Abbreviation | Definition |
|---|---|
| ARISE | Advanced Research Institute of Science and Engineering |
| ARISE | Aggressive Reduction of Inflammation Stops Events |
| ARISE | Alliance to Reward Initiatives and Social Enterprise |
| ARISE | Applied Research Innovations in Science and Engineering |
| ARISH | A Rose In Safe Haven |
| ARISS | Angle Resolved Ion Scattering Spectroscopy |
| ARISTOCRAT | Aristocracy |
| ARITM | Aritmetica |
| ARIZ | Arizonas |
| ARJ | Acceptance Responsibility and Judgment |
| ARJ | Advanced Regional Jet |
| ARJ | Ahmed Ramadhan Juma |
| ARJ | Alexander Refsum Jensenius |
| ARJ | Archive Robert Jung |
| ARJO | ArjoHuntleighs |
| ARK | Acknowledge And Reward Kids |
| ARK | Act of Random Kindless |
| ARK | Actively Restoring Kids |
| ARK | Acts of Regular Kindness |
| ARK | Address Resolution Keys |