英 [riˈækʃn] 美 [riˈækʃ(ə)n]
n. 反应，回应；反应能力（reactions）；（药物或食物引起的）不良反应；化学反应；反作用力；（对旧观念等的）抗拒；反动，守旧
[ 复数 reactions ][1]
柯林斯英汉双解大词典
reaction /rɪˈækʃən/ CET4 TEM4
1.N-VAR Your reaction to something that has happened or something that you have experienced is what you feel, say, or do because of it. 反应
2.N-COUNT A reaction against something is a way of behaving or doing something that is deliberately different from what has been done before. 反抗
3.N-SING If there is a reaction against something, it becomes unpopular. 抵触 [also no det, N 'against' n]
4.N-PLURAL Your reactions are your ability to move quickly in response to something, for example when you are in danger. 反应能力; 应变能力
5.N-UNCOUNT Reaction is the belief that the political or social system of your country should not change. 保守思想 [表不满]
6.N-COUNT A chemical reaction is a process in which two substances combine together chemically to form another substance. (化学) 反应