Word:

efficacy

ef´fi`ca`cy
n.1.Power to produce effects; operation or energy of an agent or force; production of the effect intended; as, the efficacy of medicine in counteracting disease; the efficacy of prayer.
Noun1.efficacy - capacity or power to produce a desired effect; "concern about the safety and efficacy of the vaccine"
Synonyms: efficaciousness
Antonyms:
inefficaciousness, inefficacy - a lack of efficacy
effectiveness, effectivity, effectuality, effectualness, efficacious, efficaciousness, inefficacious, inefficaciousness, inefficacy
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Effendi
Efferent
efferent neuron
Efferous
Effervesce
Effervescence
Effervescent
Effervescible
effervescing
Effervescive
Effet
Effete
Efficacious
efficaciously
efficaciousness
efficacity
-- efficacy --
efficience
efficiency
efficiency apartment
efficiency engineer
efficiency expert
efficiency of a heat engine
efficient
Efficient cause
Efficiently
Effierce
Effigial
Effigiate
Effigiation
Effigies
Effigy
Efflagitate
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