| Acronym | Meaning |
| SIAM | Single-impurity Anderson Model |
| TRIR | Time-resolved IR |
| SEE | Standard Error Of Estimate |
| PWEM | Partial-wave-expansion Method (in Electron Scattering Calcns.) |
| VMR | Vol. Mixing Ratio |
| TRC | Total Residual Chlorine |
| IAM | Internal Axis Method (in Calcns. Of Rotational Excitation In Atom-mol. Collisions) |
| LCTV | Liquid Crystal Television |
| ROM | Regional Oxidant Model |
| SUS | Saybolt Unit Seconds (viscosity Measurement) |