D defs.my
Entry 2 senses Webster, 1913

Treason

/trēz'-ən/ · Trea·son · IPA /ˈtɹiː.zən/
01 n. The offense of attempting to overthrow the government of the state to which the offender owes allegiance, or of betraying the state into th…
  1. 1.
    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.
    “The treason of the murthering in the bed.” Chaucer.
  2. 2.
    Loosely, the betrayal of any trust or confidence; treachery; perfidy.
    “If he be false, she shall his treason see.” Chaucer.
Phrases & compounds
Petit treason — See under Petit.