| Acronym | Meaning |
| ISCI | Initial-state Configuration Interaction |
| HSF | Hiller-Sucher-Feinberg (equation For Calcn. Of Spin Densities And Charge Densities In Mols.) |
| CSIN | Chemical Substance Information Network |
| NWWA | Northwest Water Authority (UK) |
| ANS | Advanced Neutron Source |
| MFE | Mercury Film Electrode |
| APC | Air Pollution Control |
| GALE | Genesis Of Atlantic Lows Experiment |
| ADA | N-(2-acetamido) Iminodiacetic Acid |
| UCDW | Ultrarelativistic Continuum Distorted Wave |