| Acronym | Meaning |
| ALMR | Advanced Liquid Metal Reactor |
| XCC | Expectation-value Coupled-cluster (in Correlation Energies And Electronic Properties Of Many-electron Systems Calcns.) |
| PAPP-A | Pregnancy-associated Plasma Protein A |
| CMX(2) | Second-order Connected Moments Expansion (method For Calcg. Correlation Energies Of Mols.) |
| LR-SCF | Low-rank SCF |
| ACS | Adiabatically Corrected Sudden |
| PECAM | Platelet Endothelial Cell Adhesion Molecule |
| NASA | National Aeronautics And Space Administration |
| CDW-EIS | Continuum Distorted Wave-eikonal Initial State (in Collisions) |
| GSA | Generalized Sudden Approximation |