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reaction  (reactions plural )
1  n-var Your reaction to something that has happened or something that you have experienced is what you feel, say, or do because of it. 
Reaction to the visit is mixed...  
2  n-count A reaction against something is a way of behaving or doing something that is deliberately different from what has been done before. 
All new fashion starts out as a reaction against existing convention...  
3  n-sing If there is a reaction against something, it becomes unpopular. 
Premature moves in this respect might well provoke a reaction against the reform...  
4  n-plural Your reactions are your ability to move quickly in response to something, for example when you are in danger. 
The sport requires very fast reactions.  
5  n-uncount Reaction is the belief that the political or social system of your country should not change., (disapproval)  Thus, he aided reaction and thwarted progress.  
6  n-count A chemical reaction is a process in which two substances combine together chemically to form another substance. 
Ozone is produced by the reaction between oxygen and ultra-violet light...  
7  n-count If you have a reaction to  a substance such as a drug, or  to  something you have touched, you are affected unpleasantly or made ill by it. 
Every year, 5000 people have life-threatening reactions to anaesthetics...