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

 

betrayal

 noun
noun
BrE BrE//bɪˈtreɪəl//
 
; NAmE NAmE//bɪˈtreɪəl//
 
[uncountable, countable]
 
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the act of betraying somebody/something or the fact of being betrayed a sense/a feeling/an act of betrayal I saw her actions as a betrayal of my trust. the many disappointments and betrayals in his life Memories of his betrayal still haunted her. a betrayal of their election promises a story of heroism, love and betrayalExtra examples The business community regarded the measures as a betrayal of election promises. The decisions were a betrayal of everything my father stood for. a betrayal of his friends The incident left me with a sense of betrayal. The women interviewed still viewed adultery as the ultimate betrayal within a marriage. This is a betrayal of their election promises.
See the Oxford Advanced American Dictionary entry: betrayal