| Acronym | Meaning |
| CELIA | Competitive Enzyme-Linked Immunoassay |
| BCIRA | British Cast Iron Research Association |
| DASP | Discontinuous Activated Sludge Process |
| GVVPT | Generalized Van Vleck Perturbation Theory |
| CSWRCB | California State Water Resources Control Board |
| REMS | Reflection Mass Spectrometry |
| ISA | Ionic Strength Adjuster |
| FNO | Frozen Natural Orbital |
| ICSTI | International Center For Scientific And Technical Information (Moscow |
| FC | Frozen Core (approxn. For Electron-atom Scattering Calcns.) |