名词

1. 反应；回应；反响
Your reaction to something that has happened or something that you have experienced is what you feel, say, or do because of it.

2. 反对;反抗;抵制
A reaction against something is a way of behaving or doing something that is deliberately different from what has been done before.

3. 抵制；抵触
If there is a reaction against something, it becomes unpopular.

4. 反应力;应变能力
Your reactions are your ability to move quickly in response to something, for example when you are in danger.

5. 保守思想;反动思想
Reaction is the belief that the political or social system of your country should not change.

6. （化学）反应，变化
A chemical reaction is a process in which two substances combine together chemically to form another substance.

7. 过敏;不良反应
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.

1. doing something in opposition to another way of doing it that you don't like

e.g. his style of painting was a reaction against cubism

2. a bodily process occurring due to the effect of some antecedent stimulus or agent

e.g. a bad reaction to the medicine
his responses have slowed with age

Synonym: response

3. an idea evoked by some experience

e.g. his reaction to the news was to start planning what to do

4. extreme conservatism in political or social matters

e.g. the forces of reaction carried the election

5. a response that reveals a person's feelings or attitude

e.g. he was pleased by the audience's reaction to his performance
John feared his mother's reaction when she saw the broken lamp

6. (mechanics) the equal and opposite force that is produced when any force is applied to a body

e.g. every action has an equal and opposite reaction

7. (chemistry) a process in which one or more substances are changed into others

e.g. there was a chemical reaction of the lime with the ground water

Synonym: chemical reaction