operating system

US /ˈɑː.pə.reɪ.t̬ɪŋ ˌsɪs.təm/
UK /ˈɑː.pə.reɪ.t̬ɪŋ ˌsɪs.təm/
"operating system" picture
1.

the software that supports a computer's basic functions, such as scheduling tasks, executing applications, and controlling peripheral devices.

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Windows is a popular operating system for personal computers.
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Linux is an open-source operating system.
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OSsystem software
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system operatoroperatoroperateoperationaloperationsystemoperating room