Incendiary \In*cen"di*a*ry\ (?; 277), n.; pl. {Incendiaries}. [L. incendiarius: cf. F. incendiaire. See {Incense} to inflame.] 1. Any person who maliciously sets fire to a building or other valuable or other valuable property. 2. A person who excites or inflames factions, and promotes quarrels or sedition; an agitator; an exciter. Several cities . . . drove them out as incendiaries. --Bentley.