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[Anglo-French treison crime of violence against a person to whom allegiance is owed, literally, betrayal, from Old French traïson, from traïr to betray, from Latin tradere to hand over, surrender]
: the offense of attempting to overthrow the government of one's country or of assisting its enemies in war
: the act of levying war against the United States or adhering to or giving aid and comfort to its enemies by one who owes it allegiance
Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.