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operative /ˈɑːpərətɪv/  

  • adjective
    ready for use :capable of being used
    most important
    If I goI will bring a saladIfhoweveris the operative wordsince I am not sure that I can go.
    noun
    plural -tives
    [count] chiefly US :a person who does secret work for a government or political organization
    a person who does work that involves using tools, operating machinery, etc.
    a skilled operative