| Acronym | Meaning |
| LFC | Lowest Feasible Concentration |
| RRPA | Relativistic Random Phase Approximation |
| CBE | Coulomb-Bethe (for Electron-ion Scattering) |
| GERM | Geochem. Earth Ref. Model |
| IWOP | Integration Within (an Ordered Product Of) Operators |
| PEEP | Positive End-expiratory Pressure |
| LHASA | Logic And Heuristics Applied To Synthetic Analysis |
| IBAC | Immobilized Biomembrane Affinity Chromatography |
| AQAM | Air Quality Assessment Model |
| PIC | Products Of Incomplete Combustion |