| Acronym | Definition |
|---|
| RAAS | Reference Ambient Air Sampler |
| RAAS | Regional Area Augmentation System |
| RAAS | Regulatory Audit Archive System |
| RAAS | Report Analysis and Archive System (Domestic Nuclear Detection Office) |
| RAAS | Robotic Armored Assault System |
| RAAS | Runway Awareness and Advisory System |