effective Meaning in the Cambridge English Dictionary
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Meaning of “effective” in the English Dictionary

"effective" in British English

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effectiveadjective

uk   us   /ɪˈfek.tɪv/

effective adjective (SUCCESSFUL)

B2 successful or ​achieving the ​results that you ​want: It's an ​extremely effective ​cure for a ​headache. The ​lighting for the ​production made a very effective use of ​shadow. She's a very effective ​teacher.
Opposite
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effective adjective (IN FACT)

[before noun] in ​fact, ​although not ​officially: Although she's not ​officiallyourboss, she's in effective ​control of the ​office.

effective adjective (IN USE)

If a ​law or ​rulebecomes effective, it ​starts to be used: The new ​laws will ​become effective next ​month.
effectiveness
noun [U] uk   us   /-nəs/
C1 There are ​doubts about the effectiveness of the new ​drug (= how ​successful it is) in ​treating the ​disease.
(Definition of effective from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"effective" in American English

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effectiveadjective

 us   /ɪˈfek·tɪv/

effective adjective (PRODUCING RESULTS)

producing the ​intendedresults, or (of a ​person) ​skilled or ​able to do something well: an effective ​policy/​strategy We’ve ​found that giving away ​samples of ​ourproduct is the most effective way to ​promote it. She’s an effective ​administrator and ​knows how to get things done.

effective adjective (IN USE)

(of ​rules or ​laws) in ​official or ​legal use: The ​lawbecomes effective next ​month.
(Definition of effective from the Cambridge Academic Content Dictionary © Cambridge University Press)

"effective" in Business English

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effectiveadjective

uk   us   /ɪˈfektɪv/
successful in ​achieving the ​result that you want: You need a workable, effective ​strategy for ​developing your ​business. Personal charisma alone does not make someone an effective ​leader. The ​consumercouncil must have ​clearduties and ​strongpowers if it is to be effective.
having ​started to ​operate or be used: The new Investment Management Agreements became effective on 1st November. He announced his ​resignation, effective immediately.
[before noun] used to describe what is actually ​true, although it may not be intended or ​stated: The ​remainder of the ​stock is ​owned by a ​consortium of ​banks which are in effective ​control of the ​hotel.
(Definition of effective from the Cambridge Business English Dictionary © Cambridge University Press)
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