| Acronym | Meaning |
| FCA | Frozen-core Appproximation |
| IGAC | International Global Atmospheric Chemistry |
| RPD | Relative Percent Difference |
| AGP | Antisymmetrized Geminal Power (wave Function) |
| QCPE | Quantum Chemistry Program Exchange |
| ALCOM | Advanced Liquid Crystalline Optical Materials |
| HAPEMS | Hazardous Air Pollutant Enforcement Management System |
| IIAES | Ion Induced Auger Electron Spectroscopy |
| SCPA | Single-site Coherent-potential Approximation (for Electronic Structure Calcns.) |
| BOFT | Bearing Oil Film Thickness |