| Acronym | Meaning |
| SS-MR-CC | State-selective Multireference Coupled-cluster |
| PICI | Positive-ion Chemical Ionization |
| FOTOS | First-order Theory Of Oscillator Strength |
| EEC | European Economic Community |
| SWRO | Seawater Reverse Osmosis |
| FSOT | Fused Silica Open Tubular |
| SCLM | Scanning Confocal Laser Microscopy |
| BTS | British Toxicology Society |
| LCAS MS | Linear Combination Of Atomic Spinors-molecular Spinors |
| QHA | Quasi-harmonic Approxn. (in Intramol. Vibrational Relaxation) |