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English definition of “reactionary”

reactionary

noun [C] uk   /riˈæk.ʃən.ər.i/ us    /-er-/ disapproving
a person who is opposed to political or social change or new ideas: Reactionaries are preventing reforms.Custom, tradition and conformity
reactionary
adjective uk   us  
Reactionary forces/elements in the industry are preventing its progress towards greater efficiency.Custom, tradition and conformity
(Definition of reactionary from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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