incendiary UK /ɪnˈsɛn.dɪ.əɹ.i/US /ɪnˈsɛn.di.ɛɹ.i/adjective 4noun 3forms 3 adjective4 •Capable of, or used for, or actually causing fire. •(figurative) Intentionally stirring up strife, riot, rebellion. •(figurative) Inflammatory, emotionally charged.Politics is an incendiary topic; it tends to cause fights to break out. •Of a damaging fire, intentionally caused rather than accidental.The Crown must prove beyond a reasonable doubt that the fire was incendiary in origin; that is, it was not accidental and that it was either intentionally or recklessly set by the accused. — 2003 noun3 •Something capable of causing fire, particularly a weapon.The military used incendiaries to destroy the building. Fortunately, the fire didn't spread. •One who maliciously sets fires. •(figurative) One who excites or inflames factions into quarrels.March 7, 1692, Richard Bentley, The Folly of Atheism Several cities […] drove them out as incendiaries. formsincendiaries · more incendiary · most incendiary