| Subject | English | German |
| gen. | Community development and demonstration action in the field of open and distance learning | Gemeinschaftsaktion zur Entwicklung und Veranschaulichung der Möglichkeiten des offenen Fernunterrichts |
| construct. | housing development scheme of open type | offener Bebauungsplan |
| construct. | open development | offene Bebauung |
| coal. | open-cut development | Tagebauaufschluss |
| coal. | open-pit development | Tagebauaufschluss |
