| Abbreviation | Definition |
|---|---|
| ACTS | Ashtabula County Transportation Systems |
| ACV | Air Cushioned Vehicle |
| ACV | Amphibious Combat Vehicle |
| ACVL | All Counties Vehicle Logistics |
| ACVOS | Advanced Commercial Vehicles Operations System |
| ACVP | Automated Commercial Vehicle Permitting |
| ACWG | Accident Classification Work Group |
| ADA | Aviation Data and Analysis System |
| ADAP | Airport Development Aid Program |
| ADAS | AWOS Data Acquisition System |
| ADC | Animal Drawn Cart |
| ADCU | Airworthiness Design and Certification Unit |
| ADDM | Automated Documentation Development and Maintenance |
| ADES | Automatic Driver Evaluation System |
| ADF | After Deducting Freight |
| ADF | Automatic Direction Finder |
| ADFR | Automatic Detach Flight Recorder |
| ADGM | Additional Divisional Genral Manager |
| ADHS | Appalachian Development Highway System |
| ADI | Aircraft De - Ice and Inhibitor |