WordReference English-Spanish Dictionary © 2014:

Principal Translations
effective adj (producing results)eficaz adj
 His methods of discipline were effective and the kids behaved themselves.
 Sus métodos de disciplina fueron eficaces y los niños se comportaron bien.
effective adj (in effect, operation)efectivo adj
 The smoking ban became effective on April 1.
 La prohibición al cigarrillo se hizo efectiva el primero de abril.
 
Additional Translations
effective adj (person)eficaz adj
 She was effective at controlling the kids.
 Ella era eficaz en controlar niños.
effective adj (available)efectivo adj
 disponible adj
 How many effective soldiers do we have?
 ¿Cuántos soldados efectivos tenemos?
 ¿Cuántos soldados disponibles tenemos?
effective adj (in reality)verdadero adj
 efectivo adj
 de hecho loc adv
 real adj
 He was the effective leader while the President was ill.
 Él fue el verdadero líder mientras el presidente estuvo enfermo.
 Él fue el líder efectivo mientras el presidente estuvo enfermo.
 Él fue el líder de hecho mientras el presidente estuvo enfermo.
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WordReference English-Spanish Dictionary © 2014:

Compound Forms:
be effective ser eficaz
cost effective, cost-effective adj (providing value for money)rentable adj
Note: hyphen used when term is an adj before a noun
 It would not be cost-effective for me to turn my hobby into my profession.
 Es sólo un hobby, no es algo suficientemente rentable como para poder dedicarme únicamente a ello.
effective force (Physics) Físicafuerza efectiva nf
effective resistance (Physics) Físicaresistencia efectiva nf
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