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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. Willful betrayal of fidelity, confidence, or trust; perfidy.
  2. n. The act or an instance of such betrayal.

Century Dictionary and Cyclopedia

  1. n. Violation of allegiance or of faith and confidence; treasonable or perfidious conduct; perfidy.
  2. n. Synonyms See perfidious.

Wiktionary

  1. n. Deliberate, often calculated, disregard for trust or faith.
  2. n. The act of violating the confidence of another, usually for personal gain.
  3. n. Treason.

GNU Webster's 1913

  1. n. Violation of allegiance or of faith and confidence; treasonable or perfidious conduct; perfidy; treason.

WordNet 3.0

  1. n. betrayal of a trust
  2. n. an act of deliberate betrayal

Etymologies

  1. Middle English trecherie, from Old French, from trichier, to trick, probably from Vulgar Latin *triccāre; see trick.

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‘treachery’ has been looked up 1889 times, added to 18 lists, and has a Scrabble score of 17.