| Acronym | Meaning |
| VMR | Vol. Mixing Ratio |
| RUSTIC | Risk Of Unsaturated/saturated Transport And Transformation Of Chemical Concentrations |
| CCAP | Center For Clean Air Policy |
| MCPN | Matrix Coherent Potential Approximation |
| VADW | Vibrationally-adiabatic Distorted-wave Method |
| MMVF | Man Made Vitreous Fibers |
| WSTCM | Watson-sphere Terminated Cluster Model (in Electronic-structure Calcns. On Crystal Defects) |
| ARMS | Angle-resolved Mass Spectrometry |
| SHC | Symmetrized Hyperspherical Coordinates (in Quantum Calcns. On Reactive Scattering) |
| NSF | Near-surface Fractionated (mantle) |