| Meaning | Category |
| Reactor Control Volume | Academic & Science->Physics |
| Receive | Computing->Telecom Governmental->NASA |
| Recovery Process | Computing->General |
| Red Caribeña de Varamientos | International->Spanish |
| Remotely Controlled Vehicle | Governmental->Military |
| River City Vineyard | Community->Religion |
| Roll Call Vote | Governmental->US Government |
| Rotary Cylinder Valve | Business->Products |
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