effective

/əˈfɛktɪv/

noun

1
Having the power to produce a required effect or effects.
“The pill is an effective method of birth control.”
2
Producing a decided or decisive effect.
“The president delivered an effective speech!”
3
Efficient, serviceable, or operative, available for useful work.
“How long does it take to make a bunch of civilians an effective military force?”
4
Actually in effect.
“The curfew is effective at midnight.”
5
(of a cycle or divisor) Having no negative coefficients.
6
(for any effective theory) approximate; Not describing the fundamental dynamic changes in some system as they happen.

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