Meaning of REACTION in English

REACTION

[noun] [C]A reaction is 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.His reaction to the news was one of complete amazement.What was his reaction towards you when you told him you were leaving him?See also reaction.A reaction is also a type of behaviour or opinion that is produced or held with the intention of being different from something.The current fashion for floaty dresses is a reaction against last year's severe suits.Her left-wing views are a reaction against the conservatism of her parents.A reaction can also be an unpleasant effect resulting from eating particular things or taking particular drugs.Some people have an allergic reaction to shellfish.A chemical reaction is two or more substances reacting with and changing each other."To every action there is an equal and opposite reaction." (Isaac Newton)

Cambridge English vocab.      Кембриджский английский словарь.