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reactive

adjective

  1. prone to reacting
  2. give a response, reaction, response
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Wiktionary

Pronunciation: /ɹiːˈæktɪv/ / /ɹiˈæktɪv/ / /ɹiːˈɛktəv/

adj

Etymology: Etymology tree English react Proto-Indo-European *-wós Proto-Indo-European *-iHwósder. Latin -īvus Old French -ifbor. Middle English -yf English -ive English reactive From react + -ive.

  1. That reacts or responds to a stimulus.
  2. That readily takes part in reactions.

    francium is the most reactive of the alkali metals.

  3. Characterized by induction or capacitance rather than resistance.
  4. Reacting to the past rather than anticipating the future, not predictive.