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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 ef·fi·ca·cy /ˈɛfɪkəsi/

From: Webster's Revised Unabridged Dictionary (1913)

 ef·fi·ca·cy n.  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.”
 Syn: -- efficacy.
 Syn: -- Virtue; force; energy; potency; efficiency.

From: WordNet (r) 2.0

      n : capacity or power to produce a desired effect; "concern
          about the safety and efficacy of the vaccine" [syn: efficaciousness]
          [ant: inefficacy]