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