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From counter- +‎ act.



counteract (third-person singular simple present counteracts, present participle counteracting, simple past and past participle counteracted)

  1. To have a contrary or opposing effect or force on
    • 1796, Erasmus Darwin, Zoonomia, or, the Laws of Organic Life
      Another tide is raised at the same time on the opposite side of the revolving earth; which is owing to the greater centrifugal motion of that side of the earth, which counteracts the gravitation of bodies near its surface.
    • 1911, 1911 Encyclopædia Britannica - Dome
      In India, in the “great mosque” of Jama Masjid (a.d. 1560) and the Gol Gumbaz, or tomb of Mahommed Adil Shah (a.d. 1630) at Bijapur, the domes are carried on pendentives consisting of arches crossing one another and projecting inwards, and their weight counteracts any thrust there may be in the dome.
  2. To deliberately act in opposition to, to thwart or frustrate


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