| Acronym | Meaning |
| MLRA | Multiple Linear Regression Analysis |
| ELNES | Electron Energy-loss Near Edge Structure |
| AMBR | Anaerobic Migrating Blanket Reactor [for Wastewater Treatment] |
| SNMS | Secondary Neutral Mass Spectrometry |
| BSRT | Biological Solids Retention Time |
| GMO | Genetically Modified Organism |
| AAS | Atomic Absorption Spectroscopy |
| FHMO | Fenske-Hall MO |
| RTCDW | Relativistic Target Continuum Distorted Wave (approxn. For Electron Capture In Ion-atom Collisions) |
| OMTP | Overlap-multipole-expansion Procedure |