sort by Rank | Alpha
| Possible Meanings | Rank |
| Saint Paul Area Synod | **** |
| St Paul Audubon Society | *** |
| South Pole Air ShowEr | *** |
| School of Professional and Adult Studies | *** |
| Swedish Peace and Arbitration Society | *** |
| State Protected Areas Service | *** |
| Society for the Promotion of Agricultural Science | *** |
| School of Pure and Applied Sciences | *** |
| saliva-periodic acid-Schiff | ** |
| solid phase antibody screen | ** |
| Survey Psychiatric Assessment Schedule | ** |
| systemic to pulmonary artery shunt | ** |
| Sarawak Photo Art Society | ** |
| Serotype-specific polysaccharide antigens | ** |
| species-specific protein antigens | ** |
| Social Policy Advisory Services | ** |
| standard peritoneal permeability analyses | ** |
| School of Pure and Applied Science | ** |
| Social Physique Anxiety Scale | ** |
| Strategic Plan for Aboriginal Services | ** |
| Sequences of phonemic approximations | ** |
| Saint Paul Audubon Society | ** |
| Space Power Architecture System | ** |
| Subgroup Presentation Algorithms System | ** |
| Symposium on Adaptive Systems | ** |
| Security Preparedness and Support | ** |
| Service Personnel Appraisal System | ** |
| Sound and Particle Absorbing System | ** |
| State Prevention Advancement and Support | ** |
| Scholarship Program Administration System | ** |
| Santa Paula Association of Skaters | ** |
| Small Projects Award Scheme | ** |
| Squash Pollinators of the Americas Survey | ** |
| Serial Poll Active State | ** |
| South Pacific Area Scholarship | ** |
| Stratified Population Analysis System | ** |
| Safety Performance and Analysis System | ** |
| Society of People Against School | ** |
| Strategic Poverty Alleviation Systems | * |
| Safety Performance Analysis Subsystem | * |
| Sponsored Project Administration System | * |
| Sea Power for Africa Symposium | * |
| Statistical Pan African Society | * |
| Space Power Architecture Study | * |
| St Petersburg Audubon Society | * |
| Structure Property Analysis Software | * |
| System Protection Advisory Subcommittee | * |
| Speech Pathology Audiology Society | * |
| St Petersburg Association of Sociologists | * |
| Software Process Assessment for Sligos S.I. | * |
| Société de Promotion de l~Aérodrome de Spa | * |
| Skill Performance Aids (Formerly ITDT) | * |