| Abbreviation | Definition |
|---|---|
| ACWH | Arlington Community Wildlife Habitat |
| ACWP | Appalachia Clean Water Partners |
| ACWP | Austin Clean Water Program |
| ACWWA | Atlantic Canada Water and Wastewater Association |
| AD | Accelerated Depreciation |
| ADAPT | Arctic Development and Adaption to Permafrost in Transition |
| ADEB | Association of Distributive Environmental Bodies |
| ADEQ | Arizona Department of Environmental Quality |
| ADEQ | Arkansas Department of Environmental Quality |
| ADFCER | Assistant Director for Fuel Cycle and Environmental Research |
| ADFS | Automatic Debris Filtration System |
| ADMS | Advanced Disaster Management Simulator |
| ADMT | Air Dispersion Modeling Team |
| ADNET | Asian Dust Network |
| ADOF | Arizona Division of Forestry |
| ADPI | Air Diffuser Performance Index |
| ADRP | Acid Deposition Reduction Program |
| ADS | Advanced Drainage Systems (type of HDPE culvert) |
| ADT | Air Data Transducer |
| ADTI | Acid Drainage Technology Initiative |