react

US /riˈækt/

UK /riˈækt/

1.

respond to something, especially with an action, feeling, or physiological change

:

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How did he react to the news?

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My skin reacts badly to certain chemicals.

:

respond answer reply counter act

2.

undergo a chemical reaction

:

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The acid will react with the metal.

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When these two chemicals react, they produce heat.