Definition from macmillandictionary.com
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My mother’s initial reaction was quite unexpected.
The reaction of any individual trauma victim is difficult to predict.
Shock is a natural reaction to such bad news.
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.
a nuclear reaction
Newton teaches that action and reaction are equal and opposite.
The reaction against traditional styles continued for another 50 years.
the forces of reaction