| Acronym | Meaning |
| CS | Centrifugal Sudden (approximation) |
| AA | Aluminum Association |
| MECA | Multiple Excitation Collisional Activation |
| GRAM | Generalized Rank Annihilation Method |
| 2PPE | Two-photon Photoemission |
| HEV | Hepatitis E Virus |
| APEX | Active Plasma Experiment Satellite |
| GLNPO | Great Lakes National Program Office |
| PSCF | Potential Source Contribution Function |
| GIAO | Gage-including Atomic Orbital |