| Acronym | Meaning |
| IE | Ion Exchange |
| HFFC | Hartree-Fock Frozen Core |
| FOE | First-order Exchange (in Electron-atom Scattering Calcn.) |
| FAAO | Free-atom Atomic Orbital |
| LPA | Linearized Propagator Approximation |
| ISV | Initial Settling Velocity |
| HIWIP | Homojunction Interfacial Work-function Internal Photoemission |
| DIDA | Direct Isotope Dilution Analysis |
| EET | Epoxyeicosatrienoic Acid |
| OPDIN | Ocean Pollution Data And Information Network |