| Abbreviation | Definition |
|---|---|
| ACCW | Auxiliary Component Cooling Water |
| ACD | Air Constrained Dampening |
| ACD | Auto-regressive Conditional Duration |
| ACDC | Alternating Current / Direct Current |
| ACDM | Automated Contour Detection Method |
| ACE | Acoustic Compliance Enhancement |
| ACEC | Advisory Committee on Electromagnetic Compatibility |
| ACFF | Alternating Current Field Measurement |
| ACFM | Advanced Coal Flow Measurement |
| ACM | Adiabatic Connection Model |
| ACMP | Advances in Condensed Matter Physics |
| ACP | American Center for Physics |
| ACP | Atmospheric Chemistry and Physics |
| ACPR | Adjacent Channel Power Ratio |
| ACR | Advanced Candu Reactor |
| ACRR | Annular Core Research Reactor |
| ACRU | Astrophysics and Cosmology Research Unit |
| ACRU | Astrophysics Cosmology Research Unit |
| ACW | Anti Clock Wise |
| ADAM | Absolute Disintegration of Available Mass |