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3 definitions found

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

 ef·fi·ca·cious /ˌɛfəˈkeʃəs/

From: Webster's Revised Unabridged Dictionary (1913)

 Ef·fi·ca·cious a.  Possessing the quality of being effective; productive of, or powerful to produce, the effect intended; as, an efficacious law.
 Syn: -- See Effectual.
 -- Ef*fi*ca*cious*ly, adv.

From: WordNet (r) 2.0

      adj 1: marked by qualities giving the power to produce an intended
             effect; "written propaganda is less efficacious than
             the habits and prejudices...of the readers"-Aldous
             Huxley; "the medicine is efficacious in stopping a
             cough" [ant: inefficacious]
      2: producing or capable of producing an intended result or
         having a striking effect; "an air-cooled motor was more
         effective than a witch's broomstick for rapid
         long-distance transportation"-LewisMumford; "effective
         teaching methods"; "effective steps toward peace"; "made
         an effective entrance"; "his complaint proved to be
         effectual in bringing action"; "an efficacious law" [syn:
         effective, effectual] [ant: ineffective]