Definition of reactionism in English:

reactionism

Pronunciation /rɪˈakʃ(ə)nɪz(ə)m/ /rɪˈakʃənɪz(ə)m/

noun

  • Reactionary principles or practice.

Origin

Mid 19th century; earliest use found in Philip Schaff (1819–1893), theologian and historian. From reaction + -ism.