Etymology
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betrayal (n.)

1798, from betray + -al (2). Earlier in the same sense were betrayment (1540s), betraying (late 14c.).

updated on June 09, 2017

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Definitions of betrayal from WordNet

betrayal (n.)
an act of deliberate betrayal;
Synonyms: treachery / treason / perfidy
betrayal (n.)
the quality of aiding an enemy;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.