| Acronym | Meaning |
| PETEOS | Plasma-enhanced Tetraethylorthosilicate |
| LTO | Laguerre-type Orbital (an Ao) |
| HRPA | Higher Random Phase Approximation |
| MCL | Maximum Contaminant Level |
| AMIP | Atmospheric Model Intercomparison Project |
| ICPMS | Inductively Coupled Plasma Mass Spectrometry |
| IVCT | Intervalence Charge Transfer |
| ADAS | Angular-dependent Auger Spectroscopy |
| EVA | Extravehicular Activity (related To Spacecraft) |
| ICMRCI | Internally Contracted MR-CI |