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operating system▼(software which controls computer)noun[UK: ˈɒ.pə.reɪt.ɪŋ ˈsɪ.stəm] [US: ˈɑː.pə.ˌret.ɪŋ ˈsɪ.stəm]
NOS▼(Network Operating System)noun[UK: nəʊz] [US: noʊz]
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