efficacy : Dictionary / Wörterbuch (BEOLINGUS, TU Chemnitz)

English Dictionary: efficacy	by the DICT Development Group
2 results for efficacy
From WordNet (r) 3.0 (2006) [wn]:
efficacy n capacity or power to produce a desired effect; "concern about the safety and efficacy of the vaccine" Synonym(s): efficacy, efficaciousness Antonym(s): inefficaciousness, inefficacy
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
Efficacy \Ef"ficacy\, 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. [bd]Of noxious efficacy.[b8] --Milton. Syn: Virtue; force; energy; potency; efficiency.