| Acronym | Meaning |
| NOET | NASA Operational Environment Team |
| ACEEE | American Council For An Energy Efficient Economy |
| ICF-CI | Interacting Correlated Fragment-CI (wave Function) (see Also SA-MCSCF) |
| MESA | Mass Concentration Extinction Size Analyzer |
| API | Air Pollution Index |
| RSE | Relativistic Symmetric Eikonal |
| NIRE | National Institute For Resources And Environment |
| RFA | Regulatory Flexibility Analysis |
| CESE | Complex Eigenvalue Shroedinger Equation |
| DZP | (double Zeta)-polarization Contracted Gaussian Basis Set |