sort by Rank | Alpha
| Possible Meanings | Rank |
| Public Access to Science Act | **** |
| Performance on Statewide Assessments | **** |
| Personal Assistance Services Association | *** |
| Purchasing and Supplies Agency | *** |
| Parallel Systems and Algorithms | *** |
| Positive Alternatives to Substance Abuse | *** |
| Publishing Association of South Africa | *** |
| Providence After School Alliance | *** |
| Politically Active Students Association | *** |
| Philadelphia Area Space Alliance | *** |
| pan african sanctuaries alliance | *** |
| PCR Amplification of Specific Alleles | *** |
| Procurement and Supply Agency | *** |
| Pre Application Skills Assessment | *** |
| Pickerington Area Soccer Association | *** |
| Pennsylvania Association of Sustainable Agriculture | *** |
| Purchasing and Supply Authority | *** |
| Pennsylvania Alternative System of Assessment | *** |
| Promotora Ambiental S A | *** |
| Pan American Surf Association | *** |
| Penang Amateur Swimming Association | ** |
| p-amino salicylic acid | ** |
| PCR allele-specific amplification | ** |
| period amplitude sequence analysis | ** |
| phosphoric acid swollen Avicel | ** |
| posterior acetabular sector angle | ** |
| proximal articular set angle | ** |
| Polish American Student Association | ** |
| PA Association of School Administrators | ** |
| Projected Assessment of System Adequacy | ** |
| Pan African Student Association | ** |
| Patterns and Software Architecture | ** |
| Pan American Surfing Association | ** |
| PCR amplification of specific alleles | ** |
| PCR-amplification of specific allele | ** |
| preferential amplification of specific alleles | ** |
| Purchase and Supply Agency | ** |
| Pipelines Authority of South Australia | ** |
| Pennsylvania Association of Secondary | ** |
| Petroleum Agency South Africa | ** |
| Public Affairs Student Association | ** |
| Preparados Alimenticios S A | ** |
| Pan American Surety Association | ** |
| Proceedings of the Astronomical Society of Australia | ** |
| PA Association for Sustainable Agriculture | ** |
| Payment Association of South Africa | ** |
| penprapa advisory study abroad | ** |
| Portuguese American Suncoast Association | ** |
| Posterior Anterior Shift in Aging | ** |
| Pipeline Authority of South Australia | ** |
| Program and Service Advisor | ** |
| Psychological Association of South Africa | ** |
| PCR amplification of a specific allele | ** |
| Physician Assistant Student Association | ** |
| People Against Sexual Abuse | ** |
| Public Affairs Society Austria | ** |
| PA Alternate System of Assessment | ** |
| Permaculture Association of South Australia | ** |
| Petroleum Agency of South Africa | ** |
| Primary Acquired Sideroblastic Anemia | ** |
| Participating Agency Services Agreement | ** |
| Pan American Society of Audiology | ** |
| Pan African Students Association | ** |
| People Against Sexual Assault | ** |
| Policy Analysis and Science Assistance | ** |
| Positive Attitudes Solutions Actions | ** |
| Professional Air Sport Association | ** |
| Protection for Anti Social Activities | ** |
| Public Affairs Students Association | ** |
| Pan Asian Student Association | ** |
| Portland Area System Administrators | ** |
| Portuguese American Soccer Academy | ** |
| Participating Agency Service Agreements | ** |
| Performance Assessment of Software Architecture | ** |
| Parkside Adult Student Alliance | ** |
| Peoria Association of School Administrators | ** |
| Program for Automated Sequential Assignment | ** |
| Prostitutes Association of South Australia | ** |
| Pakistani American Student Association | * |
| Parachute Association of SA | * |
| Participating Agencies Service Agreement | * |
| Perrysburg Area Substance Abuse | * |
| Publishers Association of SA | * |
| Penn African Student Association | * |
| Peoria Association of School Adminstrators | * |
| Philadelphia Area Songwriters Alliance | * |
| Population Association of Southern Africa | * |
| Primary Acquired Sideroblastic Anaemia | * |
| Pan American Surf Assiciation | * |
| PanAmerican Society of Audiology | * |
| Philadelphia Area Songwriters Association | * |
| Pagan Atheist Scum Alliance | * |
| Palo Alto and Stanford | * |
| participating agency support agreements | * |
| Persian and Arab Students Association | * |
| Piedmont Area Singletrack Alliance | * |
| Pan Asian Staff Association | * |
| Pennsylvania Assoc of Sustainable Agriculture | * |
| Personal Assistant Services Association | * |
| Polish American Students Alliance | * |
| Professional Accounting Society of America | * |
| Personnel and Administrative Services Agency | * |
| Permit Area and Shadow Area | * |
| Permit Area or Shadow Area | * |
| Pike Adams Sportsmans Alliance | * |
| Property and Administrative Services Act | * |