react

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re·act / rēˈakt/ • v. [intr.] respond or behave in a particular way in response to something: Iraq reacted angrily to Jordan's shift in policy the market reacted by falling a further 3.1%. ∎  (react against) respond with hostility, opposition, or a contrary course of action to: they reacted against the elite art music of their time. ∎  (of a person) suffer from adverse physiological effects after ingesting, breathing, or touching a substance: many babies react to soy-based formulas. ∎  Chem. & Physics interact and undergo a chemical or physical change: the sulfur in the coal reacts with the limestone during combustion. ∎  [tr.] Chem. cause (a substance) to undergo such a change by interacting with another substance. ∎  Stock Market (of stock prices) fall or rise in reaction to events, developments, etc.

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