| Acronym | Meaning |
| PSCI | Partitioned (orbital Hessian) Super-configuration Interaction |
| MRBW | Multireference Brillouin-Wigner |
| GLP | Great Lakes Precipitation |
| SLP | Sea Level Pressure |
| DLTFS | Deep Level Transient Fourier Spectroscopy |
| ATMOS | Atmospheric Trace Molecule Spectroscopy |
| OGCM | Oceanic General Circulation Model |
| OTLC | Open Tubular Liquid Chromatography |
| FRC | Federal Records Center |
| XCC | Expectation-value Coupled-cluster (in Correlation Energies And Electronic Properties Of Many-electron Systems Calcns.) |