DictionarytreasonBetrayal of one's country
noun

treason

TREE-zuhn/ˈtriːzn/

Betrayal of one's country, especially by helping its enemies.

The official faces a charge of treason for aiding the enemy.

A shadowed figure secretly hands sealed state documents to a foreign official, no national symbols.
Etymology

Latin traditio meant a handing over or surrender. Handing someone over to enemies supplied the connection to betrayal, which in treason became a breach of allegiance to one's country or government.

In context

Europe Through the Ages2:13
Quizling's actions were seen as a betrayal by many Norwegians. After the war ended in 1945, he was arrested and put on trial for high treason and aiding the enemy.
What Did Vidkun Quisling Do To Norway? - Europe Through the Ages

More examples

  • The trial centered on allegations of treason.
  • He regarded the betrayal as treason.
  • The law distinguished treason from ordinary political disagreement.

Forms

treason

treasonous adjective — involving betrayal of one's country

Similar words

betrayal
Breaking loyalty or trust generally.
sedition
Incitement against authority, legally distinct from treason.