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My mother's initial reaction was quite unexpected.
My parents were pretty surprised at my reaction.
The reaction from the local community was very negative.
Their reaction to the report was to ban trade with those countries.
The Fed chairman's plan received a mixed reaction on Wall Street last night.
Some people's skin has an allergic reaction to certain types of fabric.
He suffered a violent reaction to the medicine.
Temperature can affect the rate of a chemical reaction.
We are studying reactions between a number of metals and acids.
This is the American English definition of reaction. View British English definition of reaction.