| Acronym | Meaning |
| TIME | Temporally Integrated Monitoring Of Ecosystems |
| HEM | Heat-exchanger Method (in Manuf. Of Crystalline Silicon) |
| MCSTEP | Multiconfigurational Spin-tensor Electron Propagator |
| NHOMO | Next Highest Occupied Molecular Orbital |
| ANS | American Nuclear Society |
| EMAT | Effluent Microtox Acute Toxicity |
| EIS | Eikonal Initial State (in Scattering Calcns.) |
| DSDP | Deep Sea Drilling Project |
| NCS | Notification Of Compliance Status |
| NATA | National Air Toxics Assessment |