effective

/əˈfɛktɪv/

noun

adjective

Having the power to produce a required effect or effects.
"The pill is an effective method of birth control."
Similar: efficacious
Producing a decided or decisive effect.
"The president delivered an effective speech!"
Efficient, serviceable, or operative, available for useful work.
"How long does it take to make a bunch of civilians an effective military force?"

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