sort by Rank | Alpha
| Possible Meanings | Rank |
|---|
| Open Area Test Sites | *** |
| Out of Area Treatments | *** |
| Older Adults Technology Services | *** |
| Order Audit Trail System | *** |
| Office of Advanced Transportation Systems | *** |
| Oroville Area Transit System | *** |
| organic anion transport system | ** |
| Older Adult Transportation Service | ** |
| Oregon Athletic Trainers Society | ** |
| Organization of Athletic Training Students | ** |
| Online Automated Timecard System | ** |
| Office of Aeronautics and Space | ** |
| Organic Aqueous Tunable Solvents | ** |
| Oracle Applications Technology Symposium | ** |
| Original Article Tear Sheet | ** |
| Officers Advanced Training School | ** |
| Open Access Team for Scotland | ** |
| Older Adults Transportation System | ** |
| Office Automation Technology Solutions | ** |
| Orbit and Attitude Tracking System | ** |
| Older Adults Transportation Service | ** |
| OUTREACH ASSESSMENT and TREATMENT SERVICES | ** |
| Open Annotation and Tagging System | ** |
| Orthogonal Array Testing Strategy | ** |
| Options Automated Trading System | * |
| Organized Alternative Transit System | * |
| Oxford Air Training School | * |
| Orbital Analysis Tools Software | * |
| Official Assisted Technology Systems | * |
| Olefin Alkylation of Thiophenic Sulfur | * |
| On Aircraft Test Software | * |
| Onboard Acoustic Tracking System | * |
| Online Application and Testing System | * |
| Origination and Termination Service | * |
| Office Automation Technology Services | * |
| Orbit and Altitude Tracking System | * |
| Orbit Analysis Tools Software | * |
| Outcomes Assessment and Teaching Strategies | * |
| Older Alaskans Transportation Service | * |
| Operationally Adapted Tax Strategies | * |
| OAQPS Air Toxics Strategies | * |