Source : Webster's Revised Unabridged Dictionary (1913)

Seditious \Se*di"tious\, a.[L. seditiosus: cf. F. s['e]ditieux.]
   1. Of or pertaining to sedition; partaking of the nature of,
      or tending to excite, sedition; as, seditious behavior;
      seditious strife; seditious words.

   2. Disposed to arouse, or take part in, violent opposition to
      lawful authority; turbulent; factious; guilty of sedition;
      as, seditious citizens. -- {Se*di"tious*ly}, adv. --
      {Se*di"tious*ness}, n.

Source : WordNet®

seditious
     adj 1: arousing to action or rebellion [syn: {incendiary}, {incitive},
             {inflammatory}, {instigative}, {rabble-rousing}]
     2: in opposition to a civil authority or government [syn: {insurgent},
         {subversive}]