The Collaborative International Dictionary of English v.0.48:

Deflagration \Def`la*gra"tion\, n. [L. deflagratio: cf. F.
   d['e]flagration.]
   1. A burning up; conflagration. "Innumerable deluges and
      deflagrations." --Bp. Pearson.
      [1913 Webster]

   2. (Chem.) The act or process of deflagrating.
      [1913 Webster]

WordNet (r) 3.0 (2006):

deflagration
    n 1: combustion that propagates through a gas or along the
         surface of an explosive at a rapid rate driven by the
         transfer of heat

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "deflagration":
   blaze, blazing, blistering, branding, burning, burst, calcination,
   carbonization, cauterization, cautery, cineration, combustion,
   concremation, cracking, cremation, cupellation,
   destructive distillation, distillation, distilling, flaming, flare,
   flare-up, flash, flash fire, incineration, outburst, oxidation,
   oxidization, parching, pyrolysis, refining, scorching,
   scorification, searing, self-immolation, singeing, smelting,
   suttee, the stake, thermogenesis, vesication