| Subject | English | Catalan |
| cinema | open-air cinema брит. | cinema a l’aire lliure |
| cinema | open-air movie theater амер. | cinema a l’aire lliure |
| math. | open-ended classes | classes obertes |
| math. | open-ended question | pregunta oberta |
| environ. | open lawn Any relatively unobstructed field of cultivated and mown grass, especially near a house or in a park | gespa oberta |
| comp., MS | open proxy | servidor intermediari obert (A proxy server that accepts connection requests from anyone anywhere and forwards the traffic as if it has originated from the local hosts) |
| environ. | open sea The high seas lying outside the exclusive economic zones of states. All states have equal rights to navigate, to overfly, to lay submarine cables, to construct artificial islands, to fish, and to conduct scientific research within the high seas | alta mar |
| environ. | open sea fishing Fishing in the deepest parts of the sea | pesca en alta mar |
| math. | open sequential scheme | esquema seqüencial obert |
| comp., MS | Open Sync Center | Obre el Centre de sincronització (A button that opens Sync Center) |
| comp., MS | Open the new opportunity | Obre l'oportunitat nova (Check box on Convert to Opportunity dialog box where the user chooses that the opportunity will be opened after they have converted it from a task) |
| comp., MS | Open Value Subscription Agreement | Contracte d'Open Value Subscription (A Microsoft volume licensing contract available for small and mid-sized companies that provides a license grant on a subscription basis) |
| comp., MS | Open with | Obre-ho amb (A menu item that lets the user open a document using a different application than the one associated with the document type) |
| comp., MS | tap to open | toca per obrir (A text string that the user can tap to open a file downloaded from Internet Explorer) |
| comp., MS | Web app Open Platform Interface | Interfície de plataforma oberta d'aplicació web (An interface that enables a web application server (for example, Office Web Apps Server) to access and change files that are stored by a host server (such as SharePoint Server)) |
| environ. | worked-out open cut A mine where all the mineral that could be profitably exploited has been removed | mina exhaurida |