| Acronym | Meaning |
| TSDW | Torsional Spin Density Wave |
| PEMC | Pair-excitation Multiconfiguration (type Of Wave Function) |
| HCCO | Heavy Catalytic Cycle Oil |
| RFA | Regulatory Flexibility Act |
| IEV | Ion-exchange Voltammetry |
| GDS | Glow Discharge Spectrometer |
| ATA | Anaerobic Toxicity Assay |
| QRA | Quantitative Risk Assessment |
| CFS | Continuous Flow System |
| MEG | Modified Electron Gas (quantum Calcn. Method) |