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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]
operative▼(based upon a surgical operation)adjective[UK: ˈɒ.pə.rə.tɪv] [US: ˈɑː.pə.rə.tɪv]
cooperative▼(relating to a cooperative)adjective[UK: kəʊ.ˈɒ.pə.rə.tɪv] [US: koʊ.ˈɒ.pə.rə.tɪv]
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