| Acronym | Meaning |
| PSD | Prevention Of Significant Deterioration |
| SROS | Spin-restricted Open Shell |
| MDC | Maxwell Displacement Current |
| ZCLV | Zoned Constant Linear Velocity |
| MRA | Multiple Regression Analysis |
| NLLAP | National Lead Laboratory Accreditation Program |
| MBSCI | Minimum Basis Set Configuration Interaction |
| CSD | Crystal Size Distribution |
| PFC | Polarized Frozen Core Approximation |
| VCM | Variational Cellular Method (for Electronic Structure Calcns.) |