| Acronym | Meaning |
| SACF | Symmetry-adapted Configuration Function |
| COSCI | Complete Open Shell Configuration Interaction |
| PEMS | Predictive Emission Monitoring System |
| PAR | Population At Risk |
| RCS | Recoupled Centrifugal Sudden (approxn. |
| IRP | Installation Restoration Program |
| CASI | Compact Airborne Spectrographic Imager |
| PSD | Postsynaptic Density |
| ICACGP | International Commission On Atmospheric Chemistry And Global Pollution |
| BIXE | Bombardment-induced X-ray Emission |