| Acronym | Meaning |
| NRIOSA | Nonreactive Infinite-order Sudden Approxn. |
| BTDC | Bulk Thermal Desorption Chamber |
| ACNK | Al2O3/(CaO + Na2O + K2O) |
| 2PH TDA | Two-particle-hole Tamm-Dancoff Approximation (for Closed-shell |
| CDA | Cylindrical Deflector Analyzer |
| ASP | Activated Sludge Plant Or Process |
| EH | Extended Hueckel |
| DDMO | Differential Density Matrix Overlap (index |
| CJII | Canadian Joint Implementation Initiative [with Regard To Greenhouse Gas Control] |
| TBA | Tight Binding Approximation |