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Noun: grayness  grey-nus
Usage: US (elsewhere: greyness)
  1. A neutral achromatic color midway between white and black
    "The grayness of the cloudy sky matched her somber mood";
    - gray [US], grey [Brit, Cdn], greyness [Brit, Cdn]

Type of: achromatic color [US], achromatic colour [Brit, Cdn]