| Acronym | Meaning |
| RNO | Reaction Natural Orbital |
| PRE | Proton Relaxation Enhancement |
| TEA | Transversely-excited Atmospheric Pressure |
| AIPI | Ab Initio Perturbed Ion (calcn. Method) |
| LIT | Linear Ion Trap |
| ECS-EP | Energy-corrected Sudden-exponential Polynomial (scaling Law) |
| SOP/EA | Split-operator Propagator (for) Electronically Adiabatic (phenomena) |
| PMF | Proton Motive Force |
| NOPES | Nonoccupational Pesticide Exposure Study |
| NOET | NASA Operational Environment Team |