c.1375, "rebellion," from O.Fr.
sedicion, from L.
seditionem (nom.
seditio) "civil disorder, dissention," lit. "a going apart, separation," from
se- "apart" (see
secret) +
itio "a going," from pp. of
ire "to go." Meaning "conduct or language inciting to rebellion against a lawful government" is from 1838.