Definition of "achromaticity" [ach•ro•ma•tic•i•ty]

• The state or quality of being achromatic. (noun)

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• "My living room has one of those 'light tree'-type floor lamps, and I was thinking of putting a couple of gels into its top two light fixtures, to combat the painful achromaticity of the room."
• "More information: A biological quarter-wave retarder with excellent achromaticity in the visible wavelength region by NW Roberts, T-H Chiou, NJ Marshall and TW Cronin."