| Acronym | Meaning |
| OCE | One-center Expansion (SCF MO Method) |
| GCOS | Global Climate Observing System (WMO |
| NEMCA | Non-faradaic Electrochemical Modification Of Catalytic Activity |
| MEDO | Multipole Expansion Of Diatomic Overlap Approximation |
| ADS | Annular Denuder System |
| ASQC | American Society For Quality Control |
| TCDE | Two-center Dirac Equation |
| EMEP | European Monitoring And Evaluation Program |
| CEAS | Coulometric Electrode Array System |
| GDI | Gasoline Direct Injection |