Meaning of “reactionary” in the English Dictionary

"reactionary" in British English

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reactionarynoun [ C ]

uk /riˈæk.ʃən.ər.i/ us /riˈæk.ʃən.er.i/ disapproving

a person who is opposed to political or social change or new ideas:

Reactionaries are preventing reforms.
reactionary
adjective uk us

(Definition of “reactionary” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"reactionary" in American English

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reactionarynoun [ C ]

us /riˈæk·ʃəˌner·i/

social studies a person who opposes political or social change

reactionary
adjective [ not gradable ] us /riˈæk·ʃəˌner·i/

Reactionary forces opposed to the president’s reforms could move to oust him.

(Definition of “reactionary” from the Cambridge Academic Content Dictionary © Cambridge University Press)