| Acronym | Meaning |
| CC-PV(D,T,Q) | Correlation-consistent Polarized (double, Triple, Or Quadruple)-split Valence Basis Set |
| CIV | Critical Ionization Velocity (ionosphere) |
| RZM | Root Zone Method (of Wastewater Treatment) |
| LEIR | Low Energy Ion Ring |
| EPA | Environment Potential Approach (in Electronic-structure Calcn.) |
| POLARIS | Photochem. Of Ozone Loss In The Arctic Region In Summer |
| NCEA | National Center For Environmental Assessment |
| WAXS | Wide-angle X-ray Scattering |
| DTBP | Di-tert-butyl Peroxide |
| FIBOS | Focused Ion Beam Optical Spectroscopy |