2 definitions found
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Efficacy \Ef"fi*ca*cy\, n. [L. efficacia fr efficax See
{Efficacious}.]
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.
``Of noxious efficacy.'' --Milton.
Syn: Virtue; force; energy; potency; efficiency.
From WordNet r 1.6 [wn]:
efficacy
n : capacity or power to produce a desired effect [syn: {efficaciousness}]
[ant: {inefficacy}]
more about efficacy
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