| Acronym | Meaning |
 | NWWA | National Water Well Association |
| NAEP | National Association Of Environmental Professionals |
| VAMO | Variational Alternant Molecular Orbital |
| ANN | Artificial Neural Network |
| DWFBA | Distorted-wave First-order Born Approximation |
| CCPD | Charge-coupled Photodiode Device |
| NLC | Noctilucent Cloud |
| HMM | Half Molecule Model (for Electron Scattering By Molecules) |
| HERL/MIS | Health Effects Research Laboratory Management Information System |
| PCI-80 | Parametrized Configuration Interaction (with Parameter) 80 |
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