treason

Hacking your brother’s email account and sharing all his secrets with your mom could be considered an act of personal treason, meaning you have betrayed your brother.

The word treason can be traced back to the Latin word traditio(n-), which comes from the verb tradere, meaning “to hand over, betray.” If you commit treason, that’s what you do: you betray. The word is typically used to refer to the betrayal of a government or a country, like when a spy shares national secrets with another country, but it can be used to refer to personal betrayals as well.

Definitions of treason
  1. noun
    a crime that undermines the offender's government
    synonyms: high treason, lese majesty
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    type of:
    crime, criminal offence, criminal offense, law-breaking, offence, offense
    (criminal law) an act punishable by law; usually considered an evil act
  2. noun
    disloyalty by virtue of subversive behavior
    synonyms: subversiveness, traitorousness
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    types:
    betrayal
    the quality of aiding an enemy
    type of:
    disloyalty
    the quality of being disloyal
  3. noun
    an act of deliberate betrayal
    synonyms: betrayal, perfidy, treachery
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    types:
    double cross, double-crossing
    an act of betrayal
    sellout
    an act of betrayal
    type of:
    dishonesty, knavery
    lack of honesty; acts of lying or cheating or stealing
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