1. (n.) The offense of attempting to overthrow the government of the state to which the offender owes allegiance, or of betraying the state into the hands of a foreign power; disloyalty; treachery.

2. (n.) Loosely, the betrayal of any trust or confidence; treachery; perfidy.

Golconda Machiavellianism apostasy backsliding betrayal bolt breach of trust breakaway collaboration crossing-over deceit deceitfulness defection degeneration desertion disloyalty duplicity eldorado faithlessness fifth-column activity fraternization going over gold mine high treason lese majesty mine misprision misprision of treason perfidiousness perfidy petty treason quislingism ratting recidivation recidivism recreancy renunciation secession sedition seditiousness treacherousness treachery treasure treasure trove treasure-house treasury turning traitor