sedition
Concise Oxford English Dictionary © 2008 Oxford University Press:
sedition/sɪˈdɪʃn/
▶noun conduct or speech inciting rebellion against the authority of a state or monarch.
– derivatives
seditious adjective,
seditiously adverb.
seditious adjective,
seditiously adverb.
– origin ME (in the sense ‘violent strife’): from OFr., or from L. seditio(n-), from sed- ‘apart’ + itio(n-) ‘going’.
'sedition' also found in these Oxford entries:

