used or adapted for setting property on fire: incendiary bombs.
of or pertaining to the criminal setting on fire of property.
tending to arouse strife, sedition, etc.; inflammatory: incendiary speeches.
tending to inflame the senses: an incendiary extravaganza of music and dance.
noun, plural incendiaries.
a person who deliberately sets fire to buildings or other property, as an arsonist.
Military. a shell, bomb, or grenade containing napalm, thermite, or some other substance that burns with an intense heat.
a person who stirs up strife, sedition, etc.; an agitator.

1600–10; < Latin incendiārius, equivalent to incendi(um) a fire (incend(ere) to kindle (in- in-2 + -cendere, transitive v. from base of candēre to shine, be hot; see candent, candid, candor) + -ium -ium) + -ārius -ary Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
incendiary (ɪnˈsɛndɪərɪ)
1.  of or relating to the illegal burning of property, goods, etc
2.  tending to create strife, violence, etc; inflammatory
3.  (of a substance) capable of catching fire, causing fires, or burning readily
n , -aries
4.  a person who illegally sets fire to property, goods, etc; arsonist
5.  (esp formerly) a person who stirs up civil strife, violence, etc, for political reasons; agitator
6.  Also called: incendiary bomb a bomb that is designed to start fires
7.  an incendiary substance, such as phosphorus
[C17: from Latin incendiārius setting alight, from incendium fire, from incendere to kindle]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"person who sets malicious fires" (n.), c.1600; "concerning malicious fires" (adj.), 1610s, from L. incendiarius (n.), from incendium "conflagration," from incendere "set on fire," from in- "in" + *candere "to set alight, cause to glow," related to candere "to shine" (see
candle). Figurative sense of "enflaming passions" (adj.) is from 1610s. Military use, of bombs, shells, etc., attested from 1871. The obsolete verb incend is attested from c.1500.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Incendiary ammo is also available, which sets zombies on fire after gunshots.
The fire investigation unit does prosecute individuals responsible for
  incendiary fires and threats to burn property.
After the team on the ground searched the site, some of the contraband was
  destroyed with incendiary grenades and diesel fuel.
Arguments about whether to establish position limits are incendiary.
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