| Abbreviation | Definition |
|---|---|
| ADATS | Analog Delayed Annihilation Time Spectra |
| ADF | Amplitude-Dependent Friction |
| ADI | Advanced Distance Integration |
| ADM | Absolute Distance Meter |
| ADM | Arnowitt-Deser-Misner |
| ADR | Automatic Device Replacement |
| ADS | Automated Dynamic Shear |
| ADTM | Alternate Density Transmission Medium |
| ADV | Automatic Drain Valve |
| ADVP | Acoustic Doppler Velocity Profiler |
| AEC | Active Energy Control |
| AECL | Atomic Energy of Canada Limited |
| AED | Atomic Emission Detection |
| AERD | Alpha Energy Range Discrimination |
| AES | Atomic Emission Spectroscopy |
| AESR | Array Enhanced Stochastic Resonance |
| AET | Active Edge Table |
| AF | Acceleration Factor |
| AF | Alternating Field |
| AF | Anisotropic Filtering |