chromaticism ( synonym found)
Definition of chromaticism:

°the quality or state of being chromatic.
°the act or action of chromaticizing: the use of chromatic notes or tones (contrasted with diatonicism).
Definition of chromaticism:

°the quality or state of being chromatic.
°the act or action of chromaticizing: the use of chromatic notes or tones (contrasted with diatonicism).
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