Seditious is defined as:
: disposed to arouse or take part in or guilty of sedition
Sedition is defined as:
: incitement of resistance to or insurrection against lawful authority
Sedition entered English in the 1300s, part of a wave of legal terms that were introduced during that period from the French spoken by the Normans.
It ultimately comes from the Latin word literally meaning "separation," from sed-, ("apart") + -ition, ("act of going").
According to the New York Times:
The arrest of Mr. Rhodes was a major step forward in the sprawling investigation of the Capitol attack and the case marked the first time that prosecutors had filed charges of sedition.
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