Definition of treachery noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈtretʃəri//
; NAmE NAmE//ˈtretʃəri//
[uncountable, countable] (pl. treacheries)
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behaviour that involves not being loyal to somebody who trusts you; an example of this an act of treachery He was punished for his treacheries. Rumours of treachery and conspiracy began to circulate in the Queen’s court. Word OriginMiddle English: from Old French trecherie, from trechier ‘to cheat’.
See the Oxford Advanced American Dictionary entry: treachery