The Collaborative International Dictionary of English v.0.48:

Ignite \Ig*nite"\, v. i.
   To take fire; to begin to burn.
   [1913 Webster]

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]

WordNet (r) 3.0 (2006):

ignite
    v 1: cause to start burning; subject to fire or great heat;
         "Great heat can ignite almost any dry matter"; "Light a
         cigarette" [syn: ignite, light] [ant: blow out,
         extinguish, quench, snuff out]
    2: start to burn or burst into flames; "Marsh gases ignited
       suddenly"; "The oily rags combusted spontaneously" [syn:
       erupt, ignite, catch fire, take fire, combust,
       conflagrate]
    3: arouse or excite feelings and passions; "The ostentatious way
       of living of the rich ignites the hatred of the poor"; "The
       refugees' fate stirred up compassion around the world"; "Wake
       old feelings of hatred" [syn: inflame, stir up, wake,
       ignite, heat, fire up]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "ignite":
   bank, blaze up, burn, conflagrate, enkindle, fan the flame, feed,
   feed the fire, fire, fire up, flame up, flare up, inflame, kindle,
   light, light up, rekindle, relight, relume, set fire to,
   set on fire, spunk up, stir the fire, stoke, stoke the fire,
   strike a light, take fire, torch, touch off