| Oktalsystem | octal numeral system |
| Ökosystem | ecosystem |
| Wahlsystem | voting system |
| Schulsystem | school system |
| Dateisystem | file system |
| Notensystem | stave |
| Typsystem | type system |
| Untersystem | sub-system |
| Abgassystem | exhaust gas system exhaust system |
| Binärsystem | binary system |
| IT-System | IT system |
| Tonsystem | pitch space |
| Kristallsystem | crystal system |
| Katalyse | catalysis |
| Dezimalsystem | decimal system |
| Inertialsystem | inertial reference frame |
| Tunnelsystem | tunnel system |
| Justizsystem | judiciary |
| Soundsystem | sound system |
| Entladesystem | unload system |