| Acronym | Meaning |
| ACR | Acute-Chronic Toxicity Ratio |
| QDO | Quantum-defect Orbital (theory) |
| IVA | Intravehicular Activity (related To Spacecraft) |
| CCMC-T2 | Coupled-cluster Multiconfigurational (double-excitation Method With Cluster Operator Approximated By T2) |
| SAA | Serum Amyloid A |
| TALIF | Two-photon Absorption Laser Induced Fluorescence |
| UCC(N) | Unitary Coupled-cluster [truncated To Nth Order] |
| BWCCD | Brillouin-Wigner Coupled-cluster (with) Double (excitation) |
| CSRS | Cooperative State Research Service (US Dept. Of Agriculture) |
| SPDM | Single-particle Density Matrix |