| Acronym | Meaning |
| ORD | Office Of Research And Development (USEPA) |
| EBK | Einstein-Brillouin-Keller (quantization Method) |
| PORG | Photochemical Oxidants Review Group |
| APLI | Atmospheric Pressure Laser Ionization |
| MBT | Many-body Theory |
| MRD-CI | Multireference Determinant Configuration Interaction |
| PXR | Parametric X-ray |
| SGHWR | Steam-generating Heavy Water Reactor |
| APCAR | Angular Correlation Of Positron Annihilation Radiation |
| DOSY | Diffusion-ordered Spectroscopy (NMR) |