reaction
US /riˈæk.ʃən/
UK /riˈæk.ʃən/
1.
an action or feeling provoked by an event or situation
:
•
His immediate reaction was to call for help.
•
What was her reaction to the news?
2.
a chemical process in which two or more substances interact to form new substances
:
•
The experiment involved a complex chemical reaction.
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Heat can accelerate the reaction.