effective
effective
/ɪˈfektɪv/
1 producing the result that is wanted or intended; producing a successful result
Aspirin is a simple but highly effective treatment.
Some people believe that violence is an effective way of protesting.
an effective means/strategy/tool/method
I admire the effective use of colour in her paintings.
The system has proved less effective than hoped.
effective against something drugs that are effective against cancer
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preposition
at
in
the effective, if not the actual, leader of the party
In spite of what they are told, parents have no effective choice of schools.
He has now taken effective control of the country.
3 (formal) (of laws and rules) coming into use
The new speed limit on this road becomes effective from 1 June.
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e.g.