- The definition of a reaction is a response.
An example of a reaction is someone stopping their car at a stop sign.
- a return or opposing action, force, influence, etc.
- a response, as to a stimulus or influence
- a movement back to a former or less advanced condition, stage, etc.; esp., such a movement or tendency in economics or politics; extreme conservatism
- the mutual action of substances undergoing chemical change
- a process that involves changes within the nucleus of an atom
- the state resulting from such changes
- an action induced by resistance to another action
- the effect produced by an allergen
- a depression or exhaustion of energy following nervous tension, overstimulation, etc.
- an increased activity following depression
- Physiol., Psychol. an organic response to a stimulus
- a. A response to a stimulus.b. The state resulting from such a response.
- A reverse or opposing action.
- a. A tendency to revert to a former state.b. Opposition to progress or liberalism; extreme conservatism.
- Chemistry A change or transformation in which a substance decomposes, combines with other substances, or interchanges constituents with other substances.
- Physics A nuclear reaction.
- Physics An equal and opposite force exerted by a body against a force acting upon it.
- The response of cells or tissues to an antigen, as in a test for immunization.
- An action or statement in response to a stimulus or other event
- The announcement of the verdict brought a violent reaction.
- You were in the courtroom. What is your reaction?
- When I last tried to eat strawberries I had a terrible allergic reaction.
- (chemistry) A transformation in which one or more substances is converted into another by combination or decomposition
- In this reaction, the acid and base will neutralize each other, producing a salt.