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My mother’s initial reaction was quite unexpected.
Some people’s skin has an allergic reaction to certain types of fabric.
He suffered a violent reaction to the medicine.
A tragedy was only prevented by the driver’s quick reactions.
Temperature can affect the rate of a chemical reaction.
We are studying reactions between a number of metals and acids.
The reaction against traditional styles continued for another 50 years.
This is the British English definition of reaction. View American English definition of reaction.