| Subject | English | Estonian |
| comp., MS | Microsoft Disk Operating System | Microsofti kettaoperatsioonisüsteem (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) |
| comp. | mobile operating system | mobiilseadme operatsioonisüsteem |
| comp. | mobile operating system | mobiiliplatvorm |
| comp., MS | MS-DOS operating system | MS-DOS-i opsüsteem (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) |
| comp., MS | operating system | operatsioonisüsteem (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) |
| IT | operating system | opsüsteem |
| econ. | operating system | operatsioonisüsteem |
| IT | operating system | operatsioonisüsteem (tarkvara osa, programmikomp.leks arvutisüsteemi talitluse juhtimiseks) |
| IT | operating system | operatsioonsüsteem (tarkvara osa, programmikomp.leks arvutisüsteemi talitluse juhtimiseks) |