| Acronym | Meaning |
| REA | Retrospective Exposure Assessment |
| BACT | Best Available Control Technology |
| IATA | International Air Transport Association (Geneva |
| FCG | Fatigue Crack Growth |
| CTPGF | Closed Time Path Green Function (in Many-body Theory) |
| ASGP | Aerobic Suspended Growth Process |
| HDM | Humic Degradation Matter |
| RMRCI | Relativistic MR-CI |
| INDO | Intermediate Neglect Of Differential Overlap |
| HEXS | High-energy X-ray Scattering |