ADJECTIVE (3)

1. able to refract light without spectral color separation;
- Example: "chromatic lens"

2. based on a scale consisting of 12 semitones;
- Example: "a chromatic scale"

3. being or having or characterized by hue;

The Collaborative International Dictionary of English v.0.48:

Chromatic \Chro*mat"ic\, a. [L. chromaticus, Gr. ?, suited for
   color, fr. ?, ?, color; akin to ? color, ? skin, color of the
   skin.]
   1. Relating to color, or to colors.
      [1913 Webster]

   2. (Mus.) Proceeding by the smaller intervals (half steps or
      semitones) of the scale, instead of the regular intervals
      of the diatonic scale.
      [1913 Webster]

   Note: The intermediate tones were formerly written and
         printed in colors.
         [1913 Webster]

   Chromatic aberration. (Opt.) See Aberration, 4.

   Chromatic printing, printing from type or blocks covered
      with inks of various colors.

   Chromatic scale (Mus.), the scale consisting of thirteen
      tones, including the eight scale tones and the five
      intermediate tones.
      [1913 Webster]

WordNet (r) 3.0 (2006):

chromatic
    adj 1: able to refract light without spectral color separation;
           "chromatic lens"
    2: based on a scale consisting of 12 semitones; "a chromatic
       scale" [ant: diatonic]
    3: being or having or characterized by hue [ant: achromatic,
       neutral]

Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "chromatic":
   cold, colorific, coloring, cool, dichromatic, enharmonic, glowing,
   harmonious, many-colored, matching, medley, monochromatic,
   monochrome, monochromic, motley, parti-colored, pigmentary,
   polychromatic, prismatic, rainbow, semitonic, spectral, tinctorial,
   tingent, tonal, tonic, toning, variegated, warm