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react verb

  /ɹiːˈækt/
  • (physics, intransitive) To return an impulse or impression; to resist the action of another body by an opposite force
  • (chemistry, intransitive) To act upon each other; to exercise a reciprocal or a reverse effect, as two or more chemical agents; to act in opposition.
  • (chemistry, transitive) To cause chemical agents to react; to cause one chemical agent to react with another.
 reagere
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