| Acronym | Meaning |
| PO-TDSE | Periodic Orbit-time Dependent Schroedinger Equation |
| RMSECV | Root-mean-square Error Of Cross-validation |
| DWS | Diffusing-wave Spectroscopy |
| SERON | Southern Regional Oxidant Network |
| QBO | Quantitative Basis Orbital (an MO Or AO) |
| CMF | Continuous Microfiltration |
| FPD | Flame Photometric Detector (gas Chromatography) |
| VTST | Variational Transition-state Theory |
| NWC | National Water Council (UK) |
| CNDOL | Complete Neglect Of Differential Overlap-azimutal Quantum Number (of Valence AO'S) |