| Acronym | Meaning |
| PSCA | Periodic Small-cluster Approach (a Many-body Technique In Electronic-structure Calcns.) |
| CFSS | Constant-final-state Spectroscopy |
| CAMP | Continuous Air Monitoring Program |
| NCP | National Contingency Plan (Superfund) |
| CEQB | Collinear Exact Quantum (with Adiabatic) Bending (energy) (method For Reactive Scattering) |
| FPLMTO | Full-potential Linearized Muffin-tin Orbital |
| BSSEC | Basis-set Superposition Error Correction |
| WHPA | Wellhead Protection Areas |
| TPPI | Time Proportional Phase Increment |
| CCC | Convergent Close Coupling |