| Acronym | Meaning |
| APC | Activated Protein C |
| EK | Extended Koopmans (method In Ionization Potential Calcns.) |
| TDMO | Time-dependent Molecular Orbital |
| IDIMS | Interactive Digital Image Manipulation System |
| HIV | Human Immunodeficiency Virus |
| LNDO | Local Neglect Of Differential Overlap |
| DBTT | Ductile-to-brittle Transition Temperature |
| UAM | Urban Airshed Model |
| DTR | Diffusion Transfer Reversal |
| WSSA | Weed Science Society Of America |