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3 definitions found

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

 in·ef·fi·ca·cy /(ˌ)ɪˈnɛfɪkəsi/
 無效力,無效

From: Webster's Revised Unabridged Dictionary (1913)

 In·ef·fi·ca·cy n.  Lack of power to produce the desired or proper effect; inefficiency; ineffectualness; futility; uselessness; fruitlessness; as, the inefficacy of medicines or means.
    The seeming inefficacy of censures.   --Bp. Hall.
    The inefficacy was soon proved, like that of many similar medicines.   --James Gregory.
 

From: WordNet (r) 2.0

 inefficacy
      n : a lack of efficacy [syn: inefficaciousness] [ant: efficacy]