Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

English definition of “treason”

treason

noun [U] uk   /ˈtriː.zən/ us  
(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 from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
What is the pronunciation of treason?
Add Cambridge dictionaries to your browser to your website

More meanings of “treason”

Definitions of “treason” in other dictionaries

Word of the Day

bitter

a type of dark brown beer with a bitter taste

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More