operative Definition in the Cambridge English Dictionary
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Definition of “operative” - English Dictionary

Definition of "operative" - American English Dictionary

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operativeadjective

 us   /ˈɑp·ər·ə·t̬ɪv/
working, or in ​existence: Our computerized stock-control ​system is now operative. I’m ​looking for a ​large, ​affordableapartment – and "​affordable" is the operative word (= it has ​specialimportance).
(Definition of operative from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "operative" - British English Dictionary

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operativenoun [C]

uk   /ˈɒp.ər.ə.tɪv/  us   /ˈɑː.pɚ.ə.t̬ɪv/
formal a ​worker, ​especially one who is ​skilled in ​working with ​theirhands: a ​factory operative mainly US a ​person who ​workssecretly for an ​organization: a CIA operative

operativeadjective

uk   /ˈɒp.ər.ə.tɪv/  us   /ˈɑː.pɚ.ə.t̬ɪv/ formal

operative adjective (in use)

working or being used: The ​agreement will not ​become operative until all ​members have ​signed.
Opposite

operative adjective (medical)

specialized medical relating to a ​medicaloperation: an operative ​technique
(Definition of operative from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)

Definition of "operative" - Business English Dictionary

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operativenoun [C]

uk   us   /ˈɒpərətɪv/
HR, WORKPLACE a ​worker: a database/call-centre/​factory operative

operativeadjective

uk   us   /ˈɒpərətɪv/
working or being used: The ​agreement will not become operative until all ​members have ​signed. The ​greenlight comes on when the ​machine is operative.
(Definition of operative from the Cambridge Business English Dictionary © Cambridge University Press)
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