Set 

  1. An individual incendiary fire.
  2. The point or points of origin of an incendiary fire.
  3. Material left to ignite an incendiary fire at a later time.
  4. Individual lightning or railroad fires, especially when several are started within a short time.
  5. Burning material at the points deliberately ignited for backfiring, slash burning, prescribed burning, and other purposes. 
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