'greyness' definitions:

Definition of 'greyness'

From: WordNet
noun
A neutral achromatic color midway between white and black [syn: gray, grayness, grey, greyness]

Definition of 'greyness'

From: GCIDE
  • greyness \greyness\ n. a neutral achromatic color midway between while and black.
  • Syn: gray, grayness, grey. [WordNet 1.5]