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effective

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effectiveˈfɛktɪv/adjective
effective
ˈfɛktɪv/
adjective
Learner's definition of EFFECTIVE  
[more effective; most effective]  : producing a result that is wanted : having an intended effect
— opposite ineffective
of a law, rule, etc.  : in use : active
: starting at a particular time — used to introduce a clause
always used before a noun  — used to describe something that exists or has an effect but that is not officially stated or recognized

— effectiveness

noun,[noncount]
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