| Acronym | Meaning |
| CNAEL | Committee On National Accreditation Of Environmental Laboratories (US EPA) |
| NKB | Nachklarbecken; Secondary Settling Tank |
| STAIRS | Storage And Information Retrieval System |
| ESA | Energy Sudden Approxn. (in Calcns. On Reactive Scattering) |
| CNDO | Complete Neglect Of Differential Overlap |
| WAXD | Wide-angle X-ray Diffraction |
| KTPP | Potassium Tripolyphosphate |
| SCE | Semiclassical Exchange Approximation |
| ND | Nitrification Denitrification |
| ICRF | Ion Cyclotron Range Of Frequencies |