| Abbreviation | Definition |
|---|---|
| AWD | All Wheel Drive |
| AWD | Another Wheel Dragging |
| AWDL | Aviation Weather Development Laboratory |
| AWDT | Average Weekday Daily Traffic |
| AWMT | A West Marin Taxi |
| AWOS | Automated Weather Observing Station |
| AWP | Aviation Weather Processor |
| AWPG | Aviation Weather Products Generator |
| AWPR | Aberdeen Western Peripheral Route |
| AWS | All Wheel Steering |
| AWW | Aviation Weather Watch |
| AYC | Active Yaw Control |
| AZTEC | Amplitude, Zone, Time, Epoch, Coding |
| B | Body |
| B | Bulk |
| B | Bus |
| B&O | Baltimore and Ohio Railroad |
| B/L | Bill of Lading |
| BA | Bart |
| BA | Bay Area Rapid Transit |