The Collaborative International Dictionary of English v.0.48:

Luminescence \Lu`mi*nes"cence\, n. [See Luminescent.]
   1. (Physics) Any emission of light not ascribable directly to
      incandescence, and therefore occurring at low
      temperatures, as in phosphorescence and fluorescence or
      other luminous radiation resulting from vital processes,
      chemical action, friction, solution, or the influence of
      light or of ultraviolet or cathode rays, etc.
      [Webster 1913 Suppl.]

   2. (Zool.)
      (a) The faculty or power of producing light by biological
          processes, as in the firefly and glowworm. Also called
          bioluminescence.
      (b) The light produced by biological or biochemical
          processes. Also called bioluminescence.
          [Webster 1913 Suppl. +PJC]

WordNet (r) 3.0 (2006):

luminescence
    n 1: light not due to incandescence; occurs at low temperatures
    2: light from nonthermal sources [syn: luminescence, glow]

Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "luminescence":
   autoluminescence, bioluminescence, cathode luminescence,
   chemicoluminescence, chemiluminescence, corposant,
   crystalloluminescence, double corposant, electroluminescence,
   fata morgana, fluorescence, fox fire, ignis fatuus, luciferase,
   luciferin, luminophor, marshfire, noctiluscence, phosphor,
   phosphorescence, photoluminescence, radioluminescence,
   thermoluminescence, tribofluorescence, triboluminescence,
   tribophosphorescence, wisp, witch fire