| Acronym | Meaning |
| IAHR | International Association For Hydraulic Research |
| MC CMO | Multiconfigurational Complex Molecular Orbita |
| OGE | Optogalvanic Effect |
| SCADS | Superfund Chemical Analysis Data System (see CARD) |
| CT | Disinfectant Concn. Times The Contact Time |
| NBS | Nijmegen Breakage Syndrome |
| NPSO | Nonpaired Spatial Orbital |
| MC-SEA | Multichannel Static-exchange Approximation |
| MOVBET | Molecular Orbital (into) Valence Bond Exponential Transformation |
| FOS | First-order Sudden |