| Acronym | Meaning |
| AES | Auger Electron Spectroscopy |
| ORPA | Optimized Random Phase Approximation |
| GAC | Granular Activated Carbon |
| SECI | Single Excitation Configuration Interaction |
| KVP | Kohn Variational Principle |
| TAG | Trans-Atlantic Geotraverse |
| TWC | Three-Way Catalyst(s) |
| DWCDS | Drinking Water Criteria Documents |
| WMAP | Wilkinson Microwave Anisotropy Probe |
| MIOSA | Modified (rotational) Infinite Order Sudden Approxn. |