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operational▼(of or relating to operations, especially military operations)adjective[UK: ˌɒ.pə.ˈreɪ.ʃnəl] [US: ˌɑː.pə.ˈreɪ.ʃə.nəl]
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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