Hypertext Webster Gateway: "Efficacy"
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) 1.7 (wn)
efficacy
n : capacity or power to produce a desired effect [syn: {efficaciousness}]
[ant: {inefficacy}]
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