sort by Rank | Alpha
| Possible Meanings | Rank |
|---|
| Opportunities in Physical Education and Related Areas | *** |
| Oregon Prevention Education Recovery Association | ** |
| Ontario Property and Environmental Rights Alliance | ** |
| Optics and Photonics Elite Research Academy | ** |
| oklahoma psychic educational research association | ** |
| Older Persons Evaluation Review and Assessment | ** |
| Optical Processor Enhanced Receiver Architecture | ** |
| Open Process Engine for Reliable Activities | ** |
| Organic Plastic Electronics Research Alliance | * |
| Opposition Parties Election Reform Alliance | * |
| Office for Policy on Extramural Research | * |
| One Planet Economy Regional Analysis | * |
| Ontario Parole and Earned Release | * |
| Office of Policy for Extramural Research Administration | * |
| Office of Postsecondary Education Research and Assistance | * |
| Oil Pollution: Environmental Risk Assessment | * |
| Out of Pile Expulsion and Reentry Apparatus | * |