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  1. re·act
  2. verb

    • 1. respond or behave in a particular way in response to something:

      he reacted angrily to the news of his dismissal the market reacted by falling a further 3.1%
      Synonym : behave, act, take it, conduct oneself, proceed, respond, reply, answer, retaliate, comport oneself, rebel against, oppose, revolt against, rise up against
    • 2. respond with hostility, opposition, or a contrary course of action to:

      they reacted against the elite art music of their time
    • 3. (of a person) suffer from adverse physiological effects after ingesting, breathing, or touching a substance:

      many babies react to soy-based formulas
    • 4. interact and undergo a chemical or physical change:

      the sulfur in the coal reacts with the limestone during combustion
    • 5. cause (a substance) to undergo a change by interacting with another substance.

    • 6. (of stock prices) fall or rise in reaction to events, developments, etc.

  3. Variation

    • v.: verb: react, 3rd person present: reacts, gerund or present participle: reacting, past tense: reacted, past participle: reacted

    • verb

      act in response to something; respond in a particular way:

      respond with hostility or a contrary course of action to:

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