Reaction

Reaction

reaction |rēˈakSH(ə)n| noun an action performed or a feeling experienced in response to a situation or event: Carrie’s immediate reaction was one of relief. (reactions) 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.