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λειτουργικό σύστημα
comp., MS	operating system (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)
econ.	operating system
IT, dat.proc.	operating software
λειτουργικό σύστημα MS-DOS
comp., MS	MS-DOS operating system (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)
λειτουργικό σύστημα CP/M
IT, dat.proc.	CP/M system

λειτουργικό σύστημα: 22 phrases in 6 subjects

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