| Acronym | Meaning |
| BDST | Bed-depth Service Time |
| FSMRCCSD | Fock Space Multireference Coupled Cluster (with) Single (and) Double Excitations |
| NGL | Natural Gas Liquid (usually Ethane Or Propane) |
| CNDO | Complete Neglect Of Differential Overlap |
| WAS | Waste Activated Sludge |
| FPEIS | Fine Particulate Emissions Information System |
| FECS | Federation Of European Chemical Societies |
| ONCV | Orthonormality Constrained Variation (quantum Method) |
| BLP | Bragg Light Profile |
| EXES | Electron-induced X-ray Emission Spectrometry |