| Acronym | Meaning |
| VFOT | Variant Fock Operator Technique |
| CI | Compression-ignition (engine) |
| ABO | Antibonding Bond Orbital |
| APHIS | Animal And Plant Health Inspection Service |
| SCBSA | Self-consistent Boundary-site Approxn. (for D.-of-states) |
| LASER | Light Amplification By Stimulated Emission Of Radiation |
| DEM | Digital Elevation Model |
| NCC | National Computing Center |
| CBS-FCI | Complete Basis Set-full Configuration Interaction |
| MP3 | Moeller-Plesset Third-order Perturbation Theory |