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Meaning of “reaction” - Learner’s Dictionary

reaction

noun     /riˈækʃən/
CAUSED BY SOMETHING [C, U]
B2 something you say, feel, or do because of something that has happened: What was his reaction to the news?Reacting and responding
reactions mainly UK
the ability to move quickly when something suddenly happens: Drivers need to have quick reactions.Reacting and responding
CHANGE [no plural]
a change in the way people behave or think because they do not agree with the way people behaved or thought in the past: In art, there was a reaction against Realism.Reacting and responding
BAD EFFECT [C]
B2 an unpleasant feeling or illness caused by something you have eaten or used on your body: A number of people have had a bad reaction to this drug.Reacting and responding
SUBSTANCES [C]
a change that happens when two substances are put together: a chemical reaction →  See also chain reaction Physical and chemical processes
(Definition of reaction from the Cambridge Learner’s Dictionary © Cambridge University Press)
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Avoiding common errors with the word enough.
Avoiding common errors with the word enough.
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by Liz Walter Enough is a very common word, but it is easy to make mistakes with it. You need to be careful about its position in a sentence, and the prepositions or verb patterns that come after it. I’ll start with the position of enough in the sentence. When we use it with a noun,

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