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English definition of “treason”

treason

noun [U]     /ˈtriː.zən/
(the crime of) showing no loyalty to your country, especially by helping its enemies or trying to defeat its government: Guy Fawkes was executed for treason.Disloyalty, betrayal and treasonTerrorism and political crime
(Definition of treason noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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