Definition of treachery noun from the Oxford Advanced American Dictionary

 

treachery

 noun
noun
NAmE//ˈtrɛtʃəri//
 
[uncountable, countable](pl. treacheries)
 
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behavior that involves not being loyal to someone who trusts you; an example of this an act of treachery He was punished for his treacheries.
See the Oxford Advanced Learner's Dictionary entry: treachery