| Acronym | Meaning |
| CS | Centrifugal Sudden (approximation) |
| MLVSS | Mixed Liquor Volatile Suspended Solids |
| ASS | Argininosuccinate Synthetase |
| NAL | No Action Level |
| MSWI | Municipal Solid Waste Incinerator(s) |
| PIA | Peaking Impulse Approxn. (for Electron-exchange Collisions) |
| DEFT | Driven Equilibrium Fourier Transform |
| QUASH | Quality Assurance Of Sample Handling [a EU Project] |
| NISO | National Information Standards Organization |
| UBM | Under Bump Metallurgy |