Dictionary.net

an act of deliberate betrayal

disloyalty by virtue of subversive behavior

an act of deliberate betrayal

disloyalty by virtue of subversive behavior

Loosely, the betrayal of any trust or confidence; treachery; perfidy.

Treasonable.

Loosely, the betrayal of any trust or confidence; treachery; perfidy.

Treasonable.

Treasonable.

Betrayal of, or breach of allegiance toward government; treachery.

The crime of betraying or attacking the state or the government of the state to which the offender belongs; treachery; falseness to trust or pledge; in time of war, any act or utterance which gives aid and comfort to the enemy.

A betraying of the government or an attempt to overthrow it: treachery: disloyalty.

A betrayal of, or attempt to overthrow, the sovereign; treachery.

The offence of attempting to betray the state or to subvert the government of the state to which the offender belongs. High treason immediately affects the king. Petit treason involves a breach of fidelity to an individual.

The crime of a subject attempting in any way to overthrow the government of a country; a breach of fidelity; treachery; high treason, any crime affecting the safety or dignity of a sovereign or his state.

n. [French, Provencal, Latin] The offence of attempting to overthrow or betray the government of the state to which the offender owes allegiance; disloyalty; treachery; –over act of devising or compassing the death of the sovereign, or members of the royal family, or levying war against the realm, or aiding and abetting the enemies of the realm; –writing or publication of writings hostile to the safety and authority of the sovereign and the peace of the realm.