Dictionary.com
Thesaurus.com
Synonyms

treason

American  
[tree-zuhn] / ˈtri zən /

noun

  1. the offense of acting to overthrow one's government or to harm or kill its sovereign.

  2. a violation of allegiance to one's sovereign or to one's state.

  3. the betrayal of a trust or confidence; breach of faith; treachery.


treason British  
/ ˈtriːzən /

noun

  1. violation or betrayal of the allegiance that a person owes his sovereign or his country, esp by attempting to overthrow the government; high treason

  2. any treachery or betrayal

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Related Words

Treason, sedition mean disloyalty or treachery to one's country or its government. Treason is any attempt to overthrow the government or impair the well-being of a state to which one owes allegiance; the crime of giving aid or comfort to the enemies of one's government. Sedition is any act, writing, speech, etc., directed unlawfully against state authority, the government, or constitution, or calculated to bring it into contempt or to incite others to hostility, ill will or disaffection; it does not amount to treason and therefore is not a capital offense. See disloyalty.

Other Word Forms

  • supertreason noun
  • treasonable adjective
  • treasonableness noun
  • treasonably adverb

Etymology

Origin of treason

First recorded in 1175–1225; Middle English tre(i)so(u)n, from Anglo-French; Old French traïson, from Latin trāditiōn-, stem of trāditiō “delivery, transfer, betrayal”; tradition

Compare meaning

How does treason compare to similar and commonly confused words? Explore the most common comparisons:

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

A wounded John Brown was captured, tried, and hanged for treason.

From Literature

The last was Charles I, who was arrested in 1646 and executed three years later for treason.

From Salon

"I need to know that you are willing to take part in an act of treason that will decide this war for Germany," he asks.

From BBC

Burr channeled Caleb’s belief in “the sovereignty of truth” even before he faced a trial for treason orchestrated by Jefferson in 1807.

From The Wall Street Journal

Fellow Canadians slammed the NBC video on social media, with some calling it "infuriating" and one going as far as to call it "treason".

From BBC