sort by Rank | Alpha
| Possible Meanings | Rank |
| Royal Incorporation of Architects Scotland | *** |
| Radcliffe Institute of Advanced Study | *** |
| Royal Institute of the Architects | *** |
| Radio In the American Sector | *** |
| Remote Infrared Audible Signage | *** |
| Royal Incorporation of Architects of Scotland | *** |
| Recording Industry Association of Singapore | *** |
| Rutgers Integrated Administrative System | *** |
| Record Industry Association of Singapore | *** |
| Rabo International Advisory Services | *** |
| Regulatory Impact Assessment Statement | *** |
| Reynolds Intellectual Assessment Scales | *** |
| Roter Interaction Analysis System | *** |
| Regulatory Impact Analysis Statements | ** |
| Recording Industry Association Singapore | ** |
| Racial Identity Attitude Scale | ** |
| Roter Interactional Analysis System | ** |
| Roter's Interaction Analysis System | ** |
| Regional Internal Affairs Service | ** |
| Review of International American Studies | ** |
| relaxation of the internal anal sphincter | ** |
| Rapid Identification of Alternative Splicing | ** |
| Regional Integration Assistance Strategy | ** |
| Royal Institute of Architects in Scotland | ** |
| reversible focal ischemic attacks | ** |
| Radio In the American Sector berlin | ** |
| Regional Innovation Advisory Service | ** |
| Royal Institution of Architects in Scotland | ** |
| Rural Investment Advisory Services | ** |
| Remote Infrared Audible Signs | * |
| Russian International Art Societies | * |
| Returned Item Administration System | * |
| Research Institute of Advanced Studies | * |
| Research Institute for Animal Science | * |