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treason

trea·son [ trz'n ] (plural trea·sons)


noun 
Definition:
 
1. betrayal of country: a violation of the allegiance owed by somebody to his or her own country, e.g. by aiding an enemy.
See also  high treason


2. treachery: betrayal or disloyalty

3. act of betrayal: an act of betrayal or disloyalty

[12th century. Via Anglo-Norman treisoun "treacherous handing over, betrayal" < Latin tradition- (see tradition)]
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