| Abbreviation | Definition |
|---|---|
| ACQ | Alkaline Copper Quaternary |
| ACRG | Atmospheric Chemistry Research Group |
| ACS | American Chemical Society |
| ACS | Atmospheric Chemistry Suite |
| ACSF | Aerobic Cyclization System Fe-containing |
| ACSSC | American Chemical Society Student Chapter |
| ACS-YCC | American Chemical Society Younger Chemists Committee |
| ACTA | Anon Coward Takes Acid |
| AcTch | AcetylThioCHoline |
| ACTF | Analytical Chemistry Trust Fund |
| ACTM | Atmospheric Chemical Transport Model |
| ACUP | Agricultural Chemical User Permit |
| ACUP | Agricultural Chemical User Permits |
| ACV | Aggregate Compacted Value |
| ACVD | Agricultural Chemicals and Veterinary Drugs |
| ACWA | Assembled Chemical Weapons Alternatives |
| AD | Acid Detecting |
| ADA | Azodicarbonamide |
| ADBAC | Alkyl Dimethyl Benzyl Ammonium Chloride |
| ADF | Acid Detergent Fiber |