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operative▼(functional)adjective[UK: ˈɒ.pə.rə.tɪv] [US: ˈɑː.pə.rə.tɪv]
operating system▼(software which controls computer)noun[UK: ˈɒ.pə.reɪt.ɪŋ ˈsɪ.stəm] [US: ˈɑː.pə.ˌret.ɪŋ ˈsɪ.stəm]
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