| Acronym | Meaning |
 | TTI | Time-temperature Integrator |
| SCE | Semiclassical Exchange Approximation |
| TNFR | Tumor Necrosis Factor Receptor |
| TWA | Time-weighted Average Limit |
| ISSN | International Standard Serial Number |
| IEPA | Illinois Environmental Protection Agency |
| BEA | Bureau Of Economic Analysis |
| ISTEA | Intermodal Surface Transportation Efficiency Act |
| EDGAR | Electronic Data Gathering |
| WPO | Wet Peroxide Oxidation [wastewater Treatment] |
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