| Acronym | Meaning |
| LSDX | Local-spin-density (with Exact) Exchange |
| MQO | Measurement Quality Objective |
| ICZ | Initial Contact Zone(s) |
| CAST | Cyclic Activated Sludge Technol. |
| DH | Dortmund-Hoerder (German Vacuum Steel Refining) |
| ESDI | Electron Stimulated Desorption Of Ions |
| FOCO | First-order Correlation Orbital |
| MSX | Midcourse Space Experiment |
| GHSV | Gas Hourly Space Velocity |
| BHK | Baby Hamster Kidney |