| Acronym | Meaning |
| ORD | Office Of Research And Development (USEPA) |
| UCCD | (spin) Unrestricted Coupled Cluster (with) Double (excitations) |
| SXM | Scanning X-ray Microscope |
| SVM | Support Vector Machine |
| ENCAT | Epoxy Nucleophile Catalyzed Transesterification |
| MCLED | Microcavity Light-emitting Diode |
| VISITT | Vendor Information System For Innovative Treatment Technology (US EPA) |
| CCBA | Coupled-channel Born Approximation |
| EKMA | Empirical Kinetic Modeling Approach (in Air Pollution) |
| ICF-CI | Interacting Correlated Fragment-CI (wave Function) (see Also SA-MCSCF) |