| Acronym | Meaning |
| IRLG | Interagency Regulatory Liaison Group |
| UPES | Ultraviolet Photoelectron Spectroscopy |
| RQCISD | (spin) Restricted QCISD |
| EGF | Epidermal Growth Factor |
| DRS | Direct Recoil Spectroscopy |
| STREAM | Stream Transport And Agricultural Runoff Of Pesticides For Exposure Assessment Methodology |
| UPW | Ultrapure Water |
| OCSC | Orbital-charge-self-consistent (in Electronic State Calcn.) |
| QSM | Quantum-statistical Model |
| AWMA | Air And Waste Management Association |