| Acronym | Meaning |
| PAO | Pseudo-atomic Orbital |
| CISA | Continuum Intermediate-state Approxn. (for Scattering) |
| GEMS | Graphical Exposure Modeling System |
| ODCPA | Off-diagonal (disorder) Coherent-potential Approxn. |
| GTT | Glucose Tolerance Test |
| SSTI | Small System Technol. Initiative (USEPA) |
| HOEF | Harmonic Oscillator With External Field Model (in Collisions) |
| CRC | Coupled-reaction-channels (quantum Calcn. Method) |
| BPEO | Best Practicable Environmental Option |
| AFB | Anaerobic Fluidized Bed |