| Acronym | Meaning |
| TOD | Total Oxygen Demand |
| WSM | Watershed Model |
| TIGER | Technique For Importing Greater Evolution Resolution In Multidimensional NMR |
| LCPA | Local Coherent Potential Approximation |
| USACE | US Army Corp Of Engineers |
| LCI-CNDO | Limited Configuration Interaction-complete Neglect Of Differential Overlap |
| CMAQ | Community Multiscale Air Quality |
| HEV | Hybrid Electric Vehicle |
| PSCI | Partitioned (orbital Hessian) Super-configuration Interaction |
| NCMS | National Center Manufacturing Sciences |