| Acronym | Meaning |
| LSDSIC | Local-spin-density Self-interaction-correction Approxn. (in Total Energy Calcns. For Atoms) |
| ECD | Environmental Cleanup Division |
| HEPPS | 4-(2-hydroxyethyl)-1-piperazinepropanesulfonic Acid) |
| NAIP | Non-Apatite Inorganic Phosphorus |
| SSRS | Subtracted Shifted Raman Spectroscopy |
| QDIP | Quantum Dot Infrared Photodetector |
| LRTI | Lower Respiratory Tract Infection |
| FIMS | Field Ionization Mass Spectrometry |
| ASIP | Aircraft Structural Integrity Program |
| IMHEX | Internally Manifolded Heat Exchanger (molten Carbonate Fuel Cell Design) |