| Acronym | Meaning |
| QCISD(T) | Quadratic CI (with) Single (and) Double (excitations) (and) [triple Excitations Added Perturbatively] |
| HVDB | Halogenated Volatile Disinfection By-products |
| TCVA | Total Culturable Virus Assay |
| QBO | Quasi-biennial Oscillation (atm.) |
| TZP | Tetragonal Zirconia Polycrystal |
| GEKT | Generalized Extended Koopmans Theorem |
| ALICE | A Large Ion Collider Experiment |
| GOSAC | Global Ocean Storage Of Anthropogenic Carbon |
| SVCA | Soil Vapor Contaminant Assessment |
| HCL | Hollow Cathode Lamp |