| Acronym | Meaning |
| FRC | Frozen Core Approxn. |
| LAMBD | Laser Assisted Molecular Beam Deposition |
| MASS | Magic Angle Sample Spinning |
| PAM | Performance Assessment Methodology |
| USDW | Underground Source Drinking Water |
| PT | Perturbation Theory |
| EIIA | European Information Industry Association |
| IEHT | Iterative Extended Hueckel Theory |
| NRC | National Research Council |
| MCQR | Multiconfigurational Quadratic Response |