sort by Rank | Alpha
| Possible Meanings | Rank |
|---|
| Occupational Post Exposure Prophylaxis | **** |
| Ontario Pesticide Education Program | **** |
| of parent education programs | **** |
| Organization of Petroleum Exporting | *** |
| Organization of the Petroleum Exporting | *** |
| Ohio Physicians Effectiveness Program | *** |
| oscillating positive expiratory pressure | ** |
| Organisation of Petroleum Exporting | ** |
| Organisation of Petrol Exporting | ** |
| Optimal Partitioning of Electric Properties | ** |
| Office of Program Evaluation and Planning | ** |
| Online Preparedness Education Program | ** |
| One Pion Exchange Po | ** |
| Optometric Practice Enhancement Program | * |
| Orbital Plane Experiment Packages | * |