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reactive

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reactive/riˈæktɪv/adjective
reactive
/riˈæktɪv/
adjective
Learner's definition of REACTIVE  
[more reactive; most reactive]  : done in response to a problem or situation : reacting to problems when they occur instead of doing something to prevent them
— compare proactive
chemistry  : tending to change into something else when mixed with another substance
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