| Abbreviation | Definition |
|---|---|
| ROS | Registry Ordering and Supplement |
| ROS | Reports Online System |
| ROS | Results Of Sin |
| ROS | Retail Outlet Shopping |
| ROS | Return Of Saturn |
| ROS | Revenue Online Service |
| ROS | Review of Symptoms |
| ROS | Rites of Spring |
| ROS | Rod Outer Segment |
| ROS | Ron over Site |
| ROS | Rose Of Sharon |
| ROS | Roseanne |
| ROSA | Ranking Options for Soil Amelioration |
| ROSA | Rapid One Step Away |
| ROSA | Registration Of Out Of State Automobiles |
| ROSA | Remote Observation System Automation |
| ROSA | Remote Observatory Southern Alpes |
| ROSA | Remote On Screen Administration |
| ROSA | Remote Open Site Agents |
| ROSA | Remotely Operated Service Arm |