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[trech-uh-ree] /ˈtrɛtʃ ə ri/
noun, plural treacheries.
violation of faith; betrayal of trust; treason.
an act of perfidy, faithlessness, or treason.
Origin of treachery
1175-1225; Middle English trecherie < Middle French, Old French, equivalent to trech(ier) to deceive + -erie -ery
1. loyalty.
Synonym Study
1. See disloyalty. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for treachery
Contemporary Examples
Historical Examples
  • How could Robert have learned anything of his treachery to his father?

    Brave and Bold Horatio Alger
  • I should like to meet him face to face, and charge him with his treachery.

    Brave and Bold Horatio Alger
  • He came a little toward the girl who had accused him of treachery.

    Within the Law Marvin Dana
  • It was not long before they had to pay a heavy penalty for their treachery and inconstancy.

  • It after wards appears that the scheme of Rumi-naui was one of treachery.

    Apu Ollantay Anonymous
British Dictionary definitions for treachery


noun (pl) -eries
the act or an instance of wilful betrayal
the disposition to betray
Word Origin
C13: from Old French trecherie, from trechier to cheat; compare trick
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
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Word Origin and History for treachery

early 13c., from Old French trecherie "deceit, cheating" (12c.), from trechier "to cheat, deceive" (see trick).

Online Etymology Dictionary, © 2010 Douglas Harper
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