| Acronym | Meaning |
| VAP | Valence Alternation Pair (bonding Configuration Model) |
| UCC(N) | Unitary Coupled-cluster [truncated To Nth Order] |
| ECCD | Electron Cyclotron Current Drive |
| CPAA | Charged Particle Activation Analysis |
| MRM | Multiple Reaction Monitoring |
| ICAC | Institute Of Clean Air Companies |
| FAKE | Fast Accurate Kinetic-energy (MO Method) |
| IRA | Interim Response Actions |
| NAWDEX | National Water Data Exchange |
| EPAAR | EPA Acquisition Regulation Manual |