Etymology
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seditious (adj.)

mid-15c., sedicious, "tending to incite treason, given to or guilty of sedition," from Old French sedicios (Modern French séditieux) and directly from Latin seditiosus "full of discord, factious, mutinous," from seditio "civil disorder, rebellion, mutiny" (see sedition). Related: Seditiously; seditiousness. As a noun, seditionary is attested from c. 1600.

updated on April 07, 2022

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Definitions of seditious from WordNet

seditious (adj.)
arousing to action or rebellion;
Synonyms: incendiary / incitive / inflammatory / instigative / rabble-rousing
seditious (adj.)
in opposition to a civil authority or government;
Synonyms: insurgent / subversive
From wordnet.princeton.edu, not affiliated with etymonline.