| Acronym | Meaning |
| GO | Gaussian Overlap (approxn. In Mol. Calcns.) |
| KVP | Kohn Variational Principle |
| MPCA | Minnesota Pollution Control Agency |
| PSCI | Partitioned (orbital Hessian) Super-configuration Interaction |
| MNOS | Metal-nitride Oxide Semiconductor |
| IESWTR | Interim Enhanced Surface Water Treatment Rule |
| PSI-BLAST | Position-specific Iterated BLAST |
| MAES | Metastable Atom Electron Spectroscopy |
| FBR | Fast Breeder Reactor |
| PDF | Probability Density Function |