| Acronym | Meaning |
| TRD | Transition Radiation Detector |
| EMT | Effective Mass Theory (in Electronic Wave Functions Calcn.) |
| ITTFA | Iterative Target Transformation Factor Analysis |
| EBIR | Energy Based Integral Retention (in Electronic-structure Calcns.) |
| DERA | Defense Environmental Restoration Act |
| RDEQ | Reduced Dimensionality Exact Quantum (method For Reactive Scattering) |
| PRECP | Processing Emissions By Cloud And Precipitation (DOE Program) |
| EGCR | Experimental Gas-cooled Reactor |
| EXFAS | Extended Fine Auger Structure |
| CVS | Constant Volume Sampler |