| Acronym | Meaning |
| VCC-IOS | Vibrational Close-coupling-(rotational) Infinite-order Sudden (for Inelastic Mol. Collisions Calcns.) |
| PLI | Process Loading Intensity (of Biological Reactors) |
| HIPE | High Internal Phase Emulsion |
| MCT | MOS Controlled Thyristor |
| OLED | Organic Light-emitting Device |
| CI | Compression-ignition (engine) |
| LOPT | Lowest-order Perturbation Theory |
| AWWARF | American Water Works Association Research Foundation |
| MEDO | Multipole Expansion Of Diatomic Overlap Approximation |
| AQMD | Air Quality Management District |