| Acronym | Meaning |
| HREE | Heavy Rare Earth Element(s) |
| MIES | Metastable Impact Electron Spectroscopy |
| AWWA | American Water Works Association |
| RDF | Restricted Dirac-Fock (quantum Calcn. Method) |
| G-CSF | Granulocyte Colony-stimulating Factor |
| OCOS | Orbital Charge-ordering State |
| CORC | Cooperative Online Resource Catalog |
| CBI | Confidential Business Information |
| PMO | Perturbed Morse Oscillator (model Potential) |
| INR | International Normalized Ratio |