| Acronym | Meaning |
| BCO | Bounded Crystal Orbital |
| PIVCDW | Phase Integral Variational Continuum Distorted Wave |
| RSC | Risk Specific Concentration |
| OGE | One Gluon Exchange |
| FBR | Fast Breeder Reactor |
| MLPCA | Maximum Likelihood Principal Component Analysis |
| DHB | 2,4-dihydroxybenzoic Acid |
| PSD | Passive Sampling Device(s) (for Air Pollution) |
| AIIM | Association For Information And Image Management |
| HRAC | Herbicide Resistance Action Committee |