'Treachery' definitions:

Definition of 'treachery'

From: WordNet
noun
Betrayal of a trust [syn: perfidy, perfidiousness, treachery]
noun
An act of deliberate betrayal [syn: treachery, betrayal, treason, perfidy]

Definition of 'Treachery'

From: GCIDE
  • Treachery \Treach"er*y\, n. [OE. trecher["i]e, trichere, OF. trecherie, tricherie, F. tricherie trickery, from tricher to cheat, to trick, OF. trichier, trechier; probably of Teutonic origin. See Trickery, Trick.] Violation of allegiance or of faith and confidence; treasonable or perfidious conduct; perfidy; treason. [1913 Webster] [1913 Webster]
  • Be ware, ye lords, of their treachery. --Chaucer. [1913 Webster]
  • In the council chamber at Edinburgh, he had contracted a deep taint of treachery and corruption. --Macaulay. [1913 Webster] Treachetour