| Acronym | Meaning |
| ESMO | Excited-state Molecular Orbital |
| LEP | Local Electron Pair (model For Intra- & Intermol. Interactions) |
| ISEA | International Society For Exposure Analysis |
| PZEV | Partial Zero Emission Vehicle |
| CATSAT | Cooperative Astrophysics And Technology Satellite |
| PIRI | Photoinduced Rydberg Ionization |
| HMAC | Hazardous Materials Advisory Council |
| ARM | Atmospheric Radiation Measurement |
| RF | Response Factor |
| HMA | Hot Mix Asphalt |