Noun flatness has 2 senses
  1. two-dimensionality, flatness, planeness - the property of having two dimensions
    --1 is a kind of dimensionality
  2. flatness, lusterlessness, lustrelessness, mat, matt, matte - the property of having little or no contrast; lacking highlights or gloss
    --2 is a kind of dullness, dulness
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