achromatism ( synonym found)
Definition of achromatism:

(n) : the state or quality of being achromatic; as, the achromatism of a lens; achromaticity; free of colors, not emitting or separating into colors
Definition of achromatism:

(n) : the state or quality of being achromatic; as, the achromatism of a lens; achromaticity; free of colors, not emitting or separating into colors
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