sort by Rank | Alpha
| Possible Meanings | Rank |
|---|
| Associazione Italiana Ricerca Operativa | ** |
| Acoustical Investigation Research Organisation | ** |
| Association of Radiation Oncology | ** |
| Associazione Italiana di Radioterapia | ** |
| Automobile Insurance Rating Organization | ** |
| American Indian Rights Organization | ** |
| ass it radiologia oncologica | ** |
| Association of Irish Racehorse Owners | ** |
| Arkansas Institutional Research Organization | ** |
| Austin International Rescue Operations | ** |
| Authorized Internal Revenue Officer | ** |
| AMERICAN INDIAN RESEARCH OPPORTUNITY | * |
| Acoustical Investigation and Research Organisation | * |
| Associazione Italiana Radioterapisti Oncologi | * |