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

"There was a chemical reaction of the lime with the ground water"

Category: General

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

"Every action has an equal and opposite reaction"

Category: General

3.Definition: a bodily process occurring due to the effect of some antecedent stimulus or agent

"A bad reaction to the medicine", "His responses have slowed with age"

Related Noun(s):response

Category: General

4.Definition: a response that reveals a person's feelings or attitude

"He was pleased by the audience's reaction to his performance", "John feared his mother's reaction when she saw the broken lamp"

Category: General

5.Definition: an idea evoked by some experience

"His reaction to the news was to start planning what to do"

Category: General

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

"His style of painting was a reaction against cubism"

Category: General

7.Definition: extreme conservatism in political or social matters

"The forces of reaction carried the election"

Category: General