Definitions:

1. (chemistry) a process in which one or more substances are changed into others noun
   • there was a chemical reaction of the lime with the ground water
2. (mechanics) the equal and opposite force that is produced when any force is applied to a body noun
   • every action has an equal and opposite reaction
3. a bodily process occurring due to the effect of some antecedent stimulus or agent noun
   • a bad reaction to the medicine
4. a response that reveals a person's feelings or attitude noun
   • My reaction wasn't what it should have been, but I felt like I was put in a bad situation.
5. an idea evoked by some experience noun
   • Their reaction to the news was to start planning what to do.
6. doing something in opposition to another way of doing it that you don't like noun
   • This style of painting was a reaction against cubism.
7. extreme conservatism in political or social matters noun
   • the forces of reaction carried the election

Synonyms:

• chemical reaction
• response

NearBy Words:

• reactionary
• reactionism
• reactionist