Definition of “treasonable” - English Dictionary

british dictionary

“treasonable” in British English

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treasonableadjective

uk /ˈtriː.zən.ə.bəl/ us /ˈtriː.zən.ə.bəl/ also treasonous, formal

A treasonable act, crime, etc. is, or is considered to be, treason:

a treasonable offence
treasonable activities

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