operative
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/ˈɑːpərətɪv/
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/ˈɒpərətɪv/
a worker, especially one who does manual work
The factory hired new operatives to assemble the products.
a person who does secret work for a government or organization
The spy was a skilled operative who gathered important information.
working or ready to be used
The new system will be operative next week.
related to a medical operation
The patient needs operative care after surgery.