The Collaborative International Dictionary of English v.0.48:

Incinerate \In*cin"er*ate\, [LL. incineratus, p. p. of
   incinerare to incinerate; L. pref. in- in + cinis, cineris,
   ashes.]
   Reduced to ashes by burning; thoroughly consumed by fire.
   [Obs.] --Bacon.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Incinerate \In*cin"er*ate\, v. t. [imp. & p. p. Incinerated;
   p. pr. & vb. n. Incinerating.]
   To burn to ashes; to consume by fire; to burn. --Bacon.
   [1913 Webster]

         It is the fire only that incinerates bodies. --Boyle.
   [1913 Webster]

WordNet (r) 3.0 (2006):

incinerate
    v 1: become reduced to ashes; "The paper incinerated quickly"
    2: cause to undergo combustion; "burn garbage"; "The car burns
       only Diesel oil" [syn: burn, incinerate]