| Acronym | Meaning |
| WQA | Water Quality Association |
| RFG | Reformulated Gasoline |
| ERP | Emergency Response Planning |
| TC | Toxicity Characteristic |
| SOCO | Second-order Correlation Orbital |
| SP-RPAE | Spin Polarized-random Phase Approxn. (with) Exchange |
| MAXI | Monitor Of All-sky X-ray Image |
| UFF | Universal Force Field |
| LRAT | Long-range Atmospheric Transport |
| IRC | Information Resource Center |