effective
Definitions
adj
Having the power to produce a required effect or effects.
The pill is an effective method of birth control.
Fire ants circumvented the problem of an ineffective sting by having an unusual and highly effective venom that when daubed or sprayed on other ants penetrates their waxy protective integumental barrier and kills or disables them.
Producing a decided or decisive effect.
The president delivered an effective speech!
Whosoever is an effective, real cause of doing his neighbour wrong, is criminal.
Efficient, serviceable, or operative, available for useful work.
How long does it take to make a bunch of civilians an effective military force?
My effective income after taxes and child support is $500 a month.
Actually in effect.
effective immediately
The curfew is effective at midnight.
Having no negative coefficients.
noun
a soldier fit for duty
The Army of the West reached Corinth sometime after the battle of Shiloh. We were 15,000 effectives, and brought Beauregard's effective force up to 45,000 men.