effective

Meanings

1. 1
   adj

   able to accomplish a purpose

   functioning effectively

2. 2
   adj

   exerting force or influence

   the law is effective immediately

3. 3
   adj

   producing or capable of producing an intended result or having a striking effect

   an air-cooled motor was more effective than a witch's broomstick for rapid long-distance transportation-LewisMumford

4. 4
   adj

   works well as a means or remedy

   an effective reprimand

5. 5
   adj

   ready for service

   the fort was held by about 100 effective soldiers

6. 6
   adj

   Having the power to produce a required effect or effects.

   The pill is an effective method of birth control.

7. 7
   adj

   Producing a decided or decisive effect.

   The president delivered an effective speech!

8. 8
   adj

   Efficient, serviceable, or operative, available for useful work.

   How long does it take to make a bunch of civilians an effective military force?

Etymology

From French effectif, from Latin effectīvus (“productive; effective”), from efficiō (“to make; to bring about”), equivalent to effect + -ive.