| Acronym | Meaning |
| RMP4 | Restricted Moeller-Plesset Fourth-order (perturbation Theory) |
| PREEN | Pacific Rim Energy And Environment Network |
| IGCI | Industrial Gas Cleaning Institute |
| HCA | Hazardous Communication Act |
| MATHEW | Mass-Consistent-3-Dimensional Wind Field |
| DIN | Dissolved Inorganic Nitrogen |
| ASB | Aerobic Stabilization Basin |
| QCT | Quasiclassical Trajectory (method For Mol. Collision Calcns.) |
| EMPPL | Effluent Monitoring Priority Pollutants List |
| UMO | Unmodified Molecular Orbital |