Etymology
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flatness (n.)

mid-15c., "state or quality of being flat," from flat (adj.) + -ness.

updated on November 21, 2014

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Definitions of flatness from WordNet

flatness (n.)
the property of having two dimensions;
Synonyms: two-dimensionality / planeness
flatness (n.)
a want of animation or brilliance;
the almost self-conscious flatness of Hemingway's style
flatness (n.)
a deficiency in flavor;
it needed lemon juice to sharpen the flatness of the dried lentils
flatness (n.)
the property of having little or no contrast; lacking highlights or gloss;
Synonyms: lusterlessness / lustrelessness / mat / matt / matte
flatness (n.)
inactivity; showing an unusual lack of energy;
Synonyms: languor / lethargy / sluggishness / phlegm
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.