Noun | 1. | ![]() |
2. | reaction - a bodily process occurring due to the effect of some foregoing stimulus or agent; "a bad reaction to the medicine"; "his responses have slowed with age" Synonyms: response | |
3. | reaction - (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" Synonyms: chemical reaction | |
4. | reaction - an idea evoked by some experience; "his reaction to the news was to start planning what to do" | |
5. | reaction - doing something in opposition to another way of doing it that you don't like; "his style of painting was a reaction against cubism" | |
6. | reaction - extreme conservatism in political or social matters; "the forces of reaction carried the election" | |
7. | reaction - (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" |