| Acronym | Meaning |
| FREEON | Spin-free Orbital |
| MCHF-BP | Multiconfiguration Hartree-Fock Breit-Pauli |
| SAS | Surface-active Substance |
| SIOS | Semiclassical Infinite-order Sudden (in Rotationally-inelastic Scattering Calcns.) |
| MCS | Monte Carlo Simulation |
| LTE | Local Thermodn. Equil. |
| AFC | Automatic Frequency Control |
| BEJ | Best Engineering Judgement |
| OECA | Office Of Enforcement And Compliance Assurance |
| NAPRI | North American Pollutant Release Inventory |