Meaning of REACTION in English

REACTION

/ riˈækʃn; NAmE / noun

TO EVENT / SITUATION

1.

[ C , U ] reaction (to sb/sth) what you do, say or think as a result of sth that has happened :

What was his reaction to the news?

My immediate reaction was one of shock.

A spokesman said the changes were not in reaction to the company's recent losses.

There has been a mixed reaction to her appointment as director.

The decision provoked an angry reaction from local residents.

I tried shaking him but there was no reaction.

CHANGE IN ATTITUDES

2.

[ C , usually sing. , U ] reaction (against sth) a change in people's attitudes or behaviour caused by disapproval of the attitudes, etc. of the past :

The return to traditional family values is a reaction against the permissiveness of recent decades.

TO DRUGS

3.

[ C , U ] a response by the body, usually a bad one, to a drug, chemical substance, etc. :

to have an allergic reaction to a drug

TO DANGER

4.

reactions [ pl. ] the ability to move quickly in response to sth, especially if in danger :

a skilled driver with quick reactions

AGAINST PROGRESS

5.

[ U ] opposition to social or political progress or change :

The forces of reaction made change difficult.

SCIENCE

6.

[ C , U ] ( chemistry ) a chemical change produced by two or more substances acting on each other :

a chemical / nuclear reaction

—see also chain reaction

7.

[ U , C ] ( physics ) a force shown by sth in response to another force, which is of equal strength and acts in the opposite direction

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WORD ORIGIN

mid 17th cent.: from react + -ion , originally suggested by medieval Latin reactio(n-) , from react- done again, from the verb reagere .

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.