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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. Violation of allegiance toward one's country or sovereign, especially the betrayal of one's country by waging war against it or by consciously and purposely acting to aid its enemies.
  2. n. A betrayal of trust or confidence.

Century Dictionary and Cyclopedia

  1. n. A betraying; treachery; breach of faith.
  2. n. Specifically—2. Violation by a subject of his allegiance to his sovereign or liege lord, or to the chief authority of the state. In old English law it was against the king or supreme power of the state, and more specifically called high treason, or
  3. n. Synonyms See perfidious.

Wiktionary

  1. n. The crime of betraying one’s government.
  2. n. Providing aid and comfort to the enemy.

GNU Webster's 1913

  1. n. The offense of attempting to overthrow the government of the state to which the offender owes allegiance, or of betraying the state into the hands of a foreign power; disloyalty; treachery.
  2. n. Loosely, the betrayal of any trust or confidence; treachery; perfidy.

WordNet 3.0

  1. n. a crime that undermines the offender's government
  2. n. disloyalty by virtue of subversive behavior
  3. n. an act of deliberate betrayal

Etymologies

  1. Middle English, from Anglo-Norman treson, from Latin trāditiō, trāditiōn-, a handing over; see tradition.

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‘treason’ has been looked up 1615 times, loved by 1 person, added to 15 lists, and has a Scrabble score of 7.