| Acronym | Meaning |
| SAPS | Spherical Average Pseudopotential |
| ICD | International Classification Of Diseases |
| TCA | Trichloroacetic Acid |
| APWA | American Public Works Association |
| ICEAS | Intermittent Cycle Extended Aeration System (activated Sludge) |
| PTD | Probable Toxic Dose |
| GTP | Guanosine 5'-triphosphate |
| MCFC | Molten Carbonate Fuel Cells |
| DWPO | Distorted Wave Polarized Orbital |
| STORET | Storage And Retrieval Of U.S. Waterways Parametric Data |