| Rank | Abbreviation | Meaning |
|---|
| ***** | OAPA RV | aorta and pulmonary artery from the right ventricle
| |
| **** | OAPA | Offences Against the Person Act
| |
| *** | OAPA | Over the Air Parameter Administration
| |
| *** | OAPA | 1-Oleoyl-2-Acetylglyceryl-3-Phosphoric Acid
| |
| *** | OAPA | Ohio Association of Physician Assistants
| |
| *** | OAPA | Oklahoma Asphalt Pavement Association
| |
| ** | OAPA | Office of Academic Planning and Assessment
| |
| ** | OAPA | Oxford Academy of Performing Arts
| |
| ** | OAPA | Office of Academic Planning and Analysis
| |
| ** | OAPA | Oregon Chapter of the American Planning Association
| |
| ** | OAPA | Oregon American Planning Association
| |
| * | OAPA | Opacity-Associated Protein A
| |
| * | OAPA | 4-(oxoacetyl)-phenoxyacetic acid
| |
| * | OAPA | Ontario Association of Psychologica Associates
| |
| * | OAPA | Ontario Association of Psychological Associates
| |
| * | OAPA | Oregon Automotive Parts Association
| |
| * | OAPA | Oklahoma Academy of Physician
| |
| * | OAPA | Ohio Adult Parole Authority
| |
| * | OAPA | Ontario Angora Producers Association
| |
| * | OAPA | Old Allentown Preservation Association
| |
| * | OAPA | Offshore Asset Protection Articl
| |