the offense of acting to overthrow one's government or to harm or kill its sovereign.
2.
a violation of allegiance to one's sovereign or to one's state.
3.
the betrayal of a trust or confidence; breach of faith; treachery.
Origin: 1175–1225;Middle Englishtre(i)so(u)n < Anglo-French;Old Frenchtraïson < Latintrāditiōn- (stem of trāditiō) a handing over, betrayal. See tradition
Related forms
su·per·trea·son, noun
Synonyms 1. T reason , sedition mean disloyalty or treachery to one's country or its government. T reason is any attempt to overthrow the government or impair the well-being of a state to which one owes allegiance; the crime of giving aid or comfort to the enemies of one's government. S edition is any act, writing, speech, etc., directed unlawfully against state authority, the government, or constitution, or calculated to bring it into contempt or to incite others to hostility, ill will or disaffection; it does not amount to treason and therefore is not a capital offense. 2. See disloyalty.
early 13c., from Anglo-Fr. treson, from O.Fr. traison (11c.; Fr. trahison), from L. traditionem (nom. traditio) "a handing over, delivery, surrender" (see tradition). O.Fr. form influenced by the verb trair "betray." In old English law, high treason is violation by a subject
of his allegiance to his sovereign or to the state; distinguished from petit treason, treason against a subject, such as murder of a master by his servant.