The Collaborative International Dictionary of English v.0.48:

chromaticity \chromaticity\ n.
   the quality of a color as determined by its dominant
   wavelength.

   Syn: hue.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

chromaticity
    n 1: the quality of a color as determined by its dominant
         wavelength [syn: hue, chromaticity]