Law. Also high treason. Violation by a subject of his allegiance to his sovereign or to the state.

treason, an offence against the sovereign; = lèse-majesté, n. Scottish. Obsolete.

Originally Civil Law. A crime committed against a monarch or other ruler; insult of or affront to a monarch or other ruler, esp. when constituting a…

High treason.

The action of killing one's father; an instance of this. Also: betrayal of one's country.

= perduellion, n.

The action or crime of killing a near relative (now usually a father). Also figurative: the action or crime of killing the ruler of or betraying…