| Acronym | Meaning |
| SVM | State Variable Model |
| MVFF | Modified Valence Force Field |
| NDBEPR | Nitrification-denitrification Biological Excess Phosphorus Removal |
| SWAP | Surface Water Acidification Project |
| PISA | Pharmaceutical Information Systems Association |
| ARIC | Acid Rain Information Clearinghouse |
| DET | Direct Nonradiative Electronic Energy Transfer |
| NARL | National Air And Radiation Laboratory |
| TFA | Target Factor Analysis |
| PBO | Polarized Born-Oppenheimer |