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an action performed or a feeling experienced in response to a situation or event:Carrie’s immediate reaction was one of relief
) a person’s ability to respond physically and mentally to external stimuli:a skilled driver with quick reactions
an adverse physiological response to a substance that has been breathed in, ingested, or touched:such allergic reactions as hay fever and asthma a chemical process in which two or more substances act mutually on each other and are changed into different substances, or one substance changes into two or more other substances. Physics an analogous transformation of atomic nuclei or other particles. a mode of thinking or behaving that is deliberately different from previous modes of thought and behavior:the work of these painters was a reaction against fauvism opposition to political or social progress or reform:the institution is under threat from the forces of reaction Physics repulsion or resistance exerted in opposition to the impact or pressure of another body; a force equal and opposite to the force giving rise to it.