Sedition, or inciting rebellion, was the criminal act of encouraging individuals to disobey the ruling government.
In 2370, Miles O'Brien was found guilty of aiding and abetting seditious acts by a Cardassian court, a crime punishable by death. (DS9: "Tribunal")
In 2372, Ee'char guessed that O'Brien had been incarcerated in the Argrathi prison for sedition. (DS9: "Hard Time")