adj tending to excite or inflame factions, sedition, or quarrel; inflammatory; seditious.
2. incendiary ·noun any person who maliciously sets fire to a building or other valuable or other valuable property.
3. incendiary ·noun a person who excites or inflames factions, and promotes quarrels or sedition; an agitator; an exciter.
4. incendiary ·adj of or pertaining to incendiarism, or the malicious burning of valuable property; as, incendiary material; as incendiary crime.