| Subject | English | Basque |
| comp., MS | Macintosh operating system | Macintosh sistema eragilea (The name given to the Macintosh operating system, beginning with version 7.5 in September 1994, when Apple started licensing the software to other computer manufacturers) |
| comp., MS | MS-DOS operating system | MS-DOS sistema eragile (A Microsoft computer operating system with a command-line interface that is used to control many internal computer functions, such as running programs and organizing and maintaining files) |
| math. | operating characteristic | ezaugarri eragile |
| stat. | operating characteristic | eragiketa-ikerkuntza |
| environ. | operating data Data referring to the practical carrying-out of a process | ustiapen-datuak |
| comp., MS | operating system | sistema eragile (The software that controls the allocation and usage of hardware resources such as memory, central processing unit (CPU) time, disk space, and peripheral devices. The operating system is the foundation on which programs are built) |