the GNU version of the Collaborative International Dictionary of English
n. Achromatism.
The Century Dictionary and Cyclopedia
n. The state or quality of being achromatic; achromatism. See equation.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the visual property of being without chromatic color
Word Usage
"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."