Definition from macmillandictionary.com
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I wasn’t sure how you would react.
The financial markets reacted badly to the latest news on inflation.
Workers reacted angrily to the news of more job losses at the factory.
When the parliament formally criticized him, Yeltsin reacted by threatening to close it down.
The software enables the computer to interpret messages and react accordingly.
Car emissions react with sunlight to form ozone.
Some children react badly to antibiotics.