Coun′ter‐act″ (koun′t?r–?kt″), 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.