| Acronym | Meaning |
| LOCV | Lowest-order Constrained Variation |
| HERL | Health Effects Research Laboratory |
| MTEL | Maximum Tolerable Exposure Levels |
| AQAM | Air Quality Assessment Model |
| TRXRD | Time-resolved X-ray Diffraction |
| FCHF | Frozen-core Hartree-Fock |
| ISS | Intermediate Solid Solution |
| GGA | Generalized Gradient Approxn. |
| BSA | Breathing-sphere Approxn. (for Inelastic Mol. Collisions) |
| ICD | Implantable Cardioverter Defibrillator |