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chain reaction any sequence of events in which the result of one event becomes the cause of the one that follows. [3 definitions]
reaction engine an engine, such as a rocket or jet engine, that develops forward thrust by the rearward expulsion of matter, esp. ignited fuel gases.
reaction formation in psychoanalysis, the expression of a behavior that is opposite to a repressed impulse.
reaction time the interval of time between a stimulus and a response.