efficacy

1. (uncountable, usually)The ability to produce a desired effect under ideal testing conditions.

   Wirksamkeit, Wirkungsvermögen, Wirkvermögen

   эффекти́вностьeffektívnostʹ, де́йственностьdéjstvennostʹ

   ефекти́вністьefektývnistʹ, діє́вістьdijévistʹ

   capacity or power to produce a desired effect

2. (uncountable, usually)A degree of ability to produce a desired effect; effectiveness.

   Wirkungsgrad

1. This practice is of dubious efficacy.

   CC BY · Tatoeba · mailohilohi · C1Open on TatoebaReport a problem

2. Testing a vaccine for safety and efficacy will take 12 to 18 months or more.

   deEs dauert zwölf bis 18 Monate oder mehr, einen Impfstoff auf Sicherheit und Wirksamkeit zu überprüfen.

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3. Don't confuse "efficacy" with "efficiency".

   ruНе путай эффектность и эффективность.

   deVerwechsel nicht Effektivität mit Effizienz.

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4. We had the mental acumen, the efficacy of the bow and arrow, opposite the clumsy musket.

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5. Self-efficacy is the measure of the belief in one's own ability to complete tasks and reach goals.

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uncountable