Meaning

• A soldier fit for duty

Meaning

• Having the power to produce a required effect or effects.

  "The pill is an effective method of birth control."

• 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?"

• Actually in effect.

  "The curfew is effective at midnight."

• (of a cycle or divisor) Having no negative coefficients.

• (for any effective theory) approximate; Not describing the fundamental dynamic changes in some system as they happen.