| Acronym | Meaning |
| SOP/ED | Split-operator Propagator (for) Electronically Diabatic (phenomena) |
| CAM | Crassulacean Acid Metabolism (photosynthetic Pathway) |
| FEGO | Floating Ellipsoidal Gaussian Orbital |
| OCOS | Orbital Charge-ordering State |
| DASP | Discontinuous Activated Sludge Process |
| CAE | Cis-acting Element |
| EGR | Exhaust Gas Recirculation |
| AAFEB | Anaerobic Attached Film Expanded Bed |
| HFET | Heterostructure Field Effect Transistor |
| EDXD | Energy Dispersive X-ray Diffraction |