effective definition, effective meaning | English dictionary

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effective

  

      adj  
1    productive of or capable of producing a result  
2    in effect; operative  
effective from midnight     
3    producing a striking impression; impressive  
an effective entrance     
4    prenominal   actual rather than theoretical; real  
the effective income after deductions     
5    (of a military force, etc.) equipped and prepared for action  
6      (Physics)   (of an alternating quantity) having a value that is the square root of the mean of the squares of the magnitude measured at each instant over a defined period of time, usually one cycle  
      n  
7    a serviceman who is equipped and prepared for action  
  effectively      adv  
  effectiveness      n  


cost-effective  
      adj   providing adequate financial return in relation to outlay  
  cost-effectiveness      n  
English Collins Dictionary - English Definition & Thesaurus  
Collins

effective

  
1    able, active, adequate, capable, competent, effectual, efficacious, efficient, energetic, operative, productive, serviceable, useful  
2    cogent, compelling, convincing, emphatic, forceful, forcible, impressive, moving, persuasive, potent, powerful, striking, telling  
3    active, actual, current, in effect, in execution, in force, in operation, operative, real  
  
Antonyms     
   feeble, futile, inactive, inadequate, incompetent, ineffective, ineffectual, inefficient, inoperative, insufficient, otiose, pathetic, powerless, tame, unimpressive, unproductive, useless, vain, weak, worthless  

English Collins Dictionary - English synonyms & Thesaurus  

Collaborative Dictionary     English Definition
id.
the carrot is more effective than the stick
n.
work and operations made in drilling for maintaining petroleum or Gas wells effective
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