se ‧ di ‧ tion /sɪˈdɪʃ ə n/ BrE AmE noun [uncountable] formal
[ Date: 1300-1400 ; Language: Old French ; Origin: Latin seditio 'separation, sedition' , from se- 'apart' + itio 'going' ]
speech, writing, or actions intended to encourage people to disobey a government:
Trade union leaders were charged with sedition.
—seditious adjective :
a seditious speech