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4 definitions found

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

 coun·ter·act /ˌkaʊntəˈrækt/

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 coun·ter·act /ˌkaʊntəˈrækt/ 及物動詞

From: Webster's Revised Unabridged Dictionary (1913)

 Coun·ter·act v. t. [imp. & p. p. Counteracted; p. pr. & vb. n. Counteracting.] To act in opposition to; to hinder, defeat, or frustrate, by contrary agency or influence; as, to counteract the effect of medicines; to counteract good advice.

From: WordNet (r) 2.0

      v 1: act in opposition to [syn: antagonize, antagonise]
      2: oppose or check by a counteraction [syn: countercheck]
      3: oppose and mitigate the effects of by contrary actions;
         "This will counteract the foolish actions of my
         colleagues" [syn: countervail, neutralize, counterbalance]
      4: destroy property or hinder normal operations; "The
         Resistance sabotaged railroad operations during the war"
         [syn: sabotage, undermine, countermine, subvert, weaken]