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    reactive

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    reactive
    re‧ac‧tive AC /riˈæktɪv/ adjective
     Word Family: noun: reaction, reactor, reactionary, overreaction; verb: react, overreact; adjective: reactionary, reactive
    1. reacting to events or situations rather than starting or doing new things yourself:
        a reactive foreign policy
    2. technical a reactive substance changes when it is mixed with another substance:
        a highly reactive chemical