| Acronym | Meaning |
| MR-CEPM | Multireference-coupled Electron Pair Method |
| MIH | Method Of Intermediate Hamiltonians |
| OSIRIS | Optical Spectrograph And IR Imaging System |
| CCEA | Conventional Combustion Environmental Assessment |
| AREAL | Atmospheric Research And Exposure Assessment Laboratory |
| GRB | Gamma Ray Burst |
| PCM | Phase Contrast Microscopy |
| SPELL | Spectral Eulerian Lagrangian Model |
| HGG | Hot Gas Generator |
| SCP-IOS | Semiclassical Perturbation-infinite Order Sudden |