| offene Menge | open set |
| offene Frage | moot point |
| offene Linie | open file |
| offenes Ende | cliffhanger |
| offen zeigen | flaunt |
| offene Silbe | open syllable |
| offene Stelle | opening |
| kleine Menge | smattering |
| leere Menge | empty set |
| Offenes Mikro | open mic |
| Offenlegung | disclosure |
| offene Spiele | Open Game |
| offener Fonds | open-end fund |
| offener Kern | interior |
| Offenbarung | revelation Apocalypse Revelation Revelations |
| offenbaren | bare disclose reveal |
| offenlegen | reveal disclose unfold unveil |
| Affenente | freckled duck |
| Liefermenge | batch |
| Einermenge | singleton |