| Acronym | Meaning |
| MC CI | Multiconfigurational Configuration Interaction |
| MNDO | Modified Neglect Of Diatomic Overlap |
| GABA | Gamma-aminobutyric Acid |
| STEREO | Solar TErrestrial RElations Observatory |
| PIMA | Polyisocyanurate Insulation Manufacturers Association |
| AFOSR | Air Force Office Of Scientific Research (USA) |
| 4WM | Four Wave Mixing |
| TCD | Thermal Conductivity Detector (for Gas Chromatography) |
| ESP | Electron Spin Polarization |
| HEV | Hepatitis E Virus |