Meaning of “react” in the English Dictionary

"react" in British English

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reactverb [ I ]

uk /riˈækt/ us /riˈækt/

B2 to act in a particular way as a direct result of something else:

She slapped him and called him names, but he didn't react.
The judge reacted angrily to the suggestion that it hadn't been a fair trial.
Many people react (badly) to (= are made ill by) penicillin.

chemistry to change in a physical or chemical way when put with another substance:

Potassium reacts with water.

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Phrasal verb(s)

(Definition of “react” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"react" in American English

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reactverb [ I ]

us /riˈækt/

to act in a particular way as a direct result of something else:

How do you think she’ll react when she hears the news?
The State Department reacted favorably to the proposal.

chemistry If substances react, they change when brought together.

(Definition of “react” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"react" in Business English

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reactverb [ I ]

uk /riˈækt/ us

if prices or markets react, their levels rise or fall as a direct result of something that happens:

react to sth How did bank share prices react to last year's financial results?
react badly/favourably/positively The market reacted positively to last week's news of the £53.7m bid.
react with sth The shares reacted with a 22p fall to 684p.

to behave in a particular way as a direct result of something else:

react calmly/cautiously
react quickly/strongly
react to sth The union reacted angrily to the threat of job losses.
react by doing sth China has reacted to reports of unsafe products by cracking down on its own manufacturers.

(Definition of “react” from the Cambridge Business English Dictionary © Cambridge University Press)