| Acronym | Meaning |
| MOE | Margin Of Exposure |
| PDG | Patent Documentation Group |
| LSW | Localized Spherical Wave (in Electronic Structure Calcns.) |
| PTS | Position-tagged Spectroscopy |
| HAZOP | Hazard And Operability Study |
| TFRS | Transition Flow Reaction System |
| SHAPM | Shear Horizontal Acoustic Plate Mode |
| MS-RC(XI) | Multiple Scattering Relativistic Correlated (calcn. Method) |
| QWIP | Quantum Well IR Photodetector |
| IFAS | Integrated Fixed-film Activated Sludge |