Definition of reactive adjective from the Oxford Advanced American Dictionary

      

    reactive

     adjective
    adjective
    NAmE//riˈæktɪv//
     
     
    jump to other results
  1. 1(formal) showing a reaction or response The police presented a reactive rather than preventive strategy against crime. compare proactive
  2. 2(chemistry) tending to show chemical change when mixed with another substance highly reactive substances
See the Oxford Advanced Learner's Dictionary entry: reactive