• (RP) IPA: /ɹiˈækʃən(ə)ɹi/
  • (GA) IPA: /ɹiˈækʃəˌnɛɹi/


  1. Politically favoring a return to a supposed golden age of the past.
  2. (chemistry) Of, pertaining to, participating in or inducing a chemical reaction.
    • 2013, Brandon Smith, Are Individuals The Property Of The Collective? ↗
      Psychiatry extends the theory into biology in the belief that all human behavior is nothing more than a series of reactionary chemical processes in the brain that determine pre-coded genetic responses built up from the conditioning of one’s environment.
Antonyms Translations Noun

reactionary (plural reactionaries)

  1. One who is opposed to change.
  2. One who is very conservative.

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