ETYM Old Eng. tresun, treisun, traisoun, Old Fren. traďson, French trahison, Latin traditio a giving up, a delivering up, from tradere to give up, betray. Related to Traitor, Tradition.
1. A crime that undermines the offender's government; SYN. high treason, lese majesty.
2. Disloyalty by virtue of subversive behavior; SYN. subversiveness, traitorousness.
Act of betrayal, in particular against the sovereign or the state to which the offender owes allegiance.
In the us, treason is defined in the constitution as the crime of “levying war against [the United States], or adhering to their enemies, giving them aid and comfort”. Congress has the power to declare the punishment for treason.