The Collaborative International Dictionary of English v.0.48:

Ignite \Ig*nite"\ ([i^]g*n[imac]t"), v. t. [imp. & p. p.
   Ignited; p. pr. & vb. n. Igniting.] [L. ignitus, p. p. of
   ignire to ignite, fr. ignis fire. See Igneous.]
   1. To kindle or set on fire; as, to ignite paper or wood.
      [1913 Webster]

   2. (Chem.) To subject to the action of intense heat; to heat
      strongly; -- often said of incombustible or infusible
      substances; as, to ignite iron or platinum.
      [1913 Webster]