| Acronym | Meaning |
| EPACSAR | EPA Chemical Activities Status Report |
| MCA | Middle Cerebral Artery |
| PAC | Polyaluminum Chloride |
| UDF | Unrestricted Dirac-Fock |
| QMC | Quantum Monte-Carlo (theory For Many-electron Atoms And Mols.) |
| CERES | Coalition For Economically Responsible Economies |
| VASS | Variable Angle Sampling Spinning |
| BORT | Bond Orbital Resonance Theory |
| L2MS | 2-step Laser Mass Spectrometry |
| MS X(ALPHA) | Multiple-scattering X(alpha) Exchange Method |