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reaction
1: the act or process or an instance of reacting2: bodily response to or activity aroused by a stimulus: a: an action induced by vital resistance to another action; especially : the response of tissues to a foreign substance (as an antigen or infective agent) b: depression or exhaustion due to excessive exertion or stimulation c: abnormally heightened activity succeeding depression or shock d: a mental or emotional disorder forming an individual's response to his or her life situation3: the force that a body subjected to the action of a force from another body exerts in the opposite direction4 a (1): chemical transformation or change : the interaction of chemical entities (2): the state resulting from such a reaction b: a process involving change in atomic nuclei
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