sort by Rank | Alpha
| Possible Meanings | Rank |
| Performing Arts After School | *** |
| Physical Activity Aging and Sports | *** |
| Premium Audit Advisory Service | *** |
| Philippine Association for the Advancement of Science | *** |
| Physician Assured Access System | *** |
| Panic and Anticipatory Anxiety Scale | *** |
| plasma amino acid spectrum | ** |
| Premorbid Asocial Adjustment Scale | ** |
| Presley Adolescent Alcohol Scale | ** |
| phosphonic acid analog of serine | ** |
| Pan American Acridological Society | ** |
| Partnership Academy Alternative School | ** |
| Practical and Applied Arts Survey | ** |
| Port Angeles Air Station | ** |
| Pike Anglers Alliance for Scotland | ** |
| Pan African Association of Surgeons | ** |
| Pension Annuity Advisory Service | ** |
| Pan African Arts Society | ** |
| Pharmacy Audit Assistance Service | ** |
| Production Accounting and Auditing System | ** |
| Polish Association for American Studies | ** |
| Pravasi Adhikar Aandolan Samiti | ** |
| Pre Arranged Absence Slip | ** |
| Parents of African American Students | ** |
| Post Archean Average Shale | ** |
| Post Archean Australian Shales | ** |
| Programmed Activities After School | ** |
| Polish American Artists Society | ** |
| Prince Albert Angling Society | ** |
| Physical Activity Affect Scale | ** |
| Partai Aceh Aman Sejahtera | ** |
| Pre Applied Adhesive System | ** |
| Program Advisory and Assistance Services | ** |
| Post Active Acid Sulfate | ** |
| Publications of the American Astronomical Society | ** |
| Post Abortionist Assassination Seminars | ** |
| PushToTest as A Service | ** |
| Programmable Adaptable Assembly System | ** |
| Positive Action Assessment Strategy | ** |
| Public Aid Accounting System | ** |
| Pan American Allergy Society | * |
| Physical Activity Analysis Software | * |
| Pravaas Adhikar Andolan Samiti | * |
| Personal Attribute Assessment System | * |
| Pre Adolescent Adjustment Scale | * |
| Princeton Alumni Association of Singapore | * |
| Professional Autograph Authentication Services | * |
| Pacific and Asian Studies | * |
| Pemphigus Area and Activity Score | * |
| Pravas Adhikar Andolan Samiti | * |
| Publ Amer Astron Soc | * |
| Pakistan Audit and Account Service | * |