Longman Dictionary of Contemporary English homepage

Date: 1100-1200
Language: Old French
Origin: traison, from Latin traditio 'act of handing over or betraying', from tradere; TRAITOR

treason

 noun
     
trea‧son [uncountable]
the crime of being disloyal to your country or its government, especially by helping its enemies or trying to remove the government using violence
treason against
Richter is accused of committing treason against the state.
The defendant was convicted of high treason (=treason of the worst kind) and sentenced to death.
—treasonable also treasonous adjective:
a treasonable act against the head of state
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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