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treachery

[trech-uh-ree] /ˈtrɛtʃ ə ri/
noun, plural treacheries.
1.
violation of faith; betrayal of trust; treason.
2.
an act of perfidy, faithlessness, or treason.
Origin of treachery
1175-1225
1175-1225; Middle English trecherie < Middle French, Old French, equivalent to trech(ier) to deceive + -erie -ery
Synonyms
1. See disloyalty.
Antonyms
1. loyalty.
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for treachery

treachery

/ˈtrɛtʃərɪ/
noun (pl) -eries
1.
the act or an instance of wilful betrayal
2.
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
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Word Origin and History for treachery
n.

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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