| Acronym | Meaning |
| HDT | Heat Distortion Temperature |
| MRINDO | Modified Rydberg Intermediate Neglect Of Differential Overlap |
| PMC-SCF | Pair Multiconfiguration-SCF (with Electron Pair Optimization) |
| PNNL | Pacific Northwest National Laboratory |
| EIFS | Exterior Insulation And Finish Systems [coatings] |
| EBS | Engineered Barrier System (for Hazardous Waste Disposal) |
| LMHEMT | Lattice Matched High Electron Mobility Transistor |
| ACCAD | Advisory Committee On Climate Applications And Data |
| PSSR | Perturbed Stationary State With Relativistic Effects |
| ISPM | In-situ Particle Monitor |