| Acronym | Meaning |
| EHF | Extended Hartree-Fock |
| GCL | Geosynthetic Clay Liner |
| SED | Spectral Energy Distribution |
| SOEH | Scaled One-electron Hamiltonian (in SCF Calcns. On Mols.) |
| IAHR | International Association For Hydraulic Research |
| DELFIA | Dissociation-enhanced Lanthanide Fluoroimmunoassay |
| REMCO | ISO Council Committee On Reference Materials |
| CAAA | Clean Air Act Amendments (of 1990) |
| SPG | Sequential Product (of) Geminals |
| PCA | Polar Cap Absorption |