Meaning of “reaction” in the English Dictionary

"reaction" in English

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uk /riˈæk.ʃən/ us /riˈæk.ʃən/

reaction noun (BEHAVIOUR)

B2 [ C ] behaviour, a feeling or an action that is a direct result of something else:

I love to watch people's reactions when I say who I am.
There has been an immediate/widespread/hostile reaction against the government's proposed tax increases.
Reactions to the proposal so far have been adverse/favourable/mixed.
reactions [ plural ]

someone's ability to act quickly when something happens:

You need to have quick reactions to play these computer games.

[ C usually singular ] a type of behaviour or opinion that is produced or held with the intention of being different from something else:

Her left-wing views are a reaction against the conservatism of her parents.

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(Definition of “reaction” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"reaction" in American English

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reactionnoun [ C ]

us /riˈæk·ʃən/

behavior, a feeling, or an action that is a direct result of something else:

My initial reaction was to call off the party.
Senator, what is your reaction to the proposal to cut Medicare benefits?

A reaction is also a change that opposes a previous opinion or behavior:

His art is a reaction against photographic realism.

biology A reaction can also be an unpleasant effect on the body resulting from something eaten or taken, such as a drug.

chemistry A chemical reaction is the change that happens when two or more substances are mixed with each other.

(Definition of “reaction” from the Cambridge Academic Content Dictionary © Cambridge University Press)

"reaction" in Business English

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reactionnoun [ C or U ]

uk /riˈækʃən/ us

the way that something happens, or that someone does something, as a result of something else:

reaction to sth We've seen little market reaction to the latest inflation figures.
reaction against sth There was an immediate reaction against the proposed tax increases.

(Definition of “reaction” from the Cambridge Business English Dictionary © Cambridge University Press)