noun
The state of being flat
The state of being two-dimensional; planar : planarity
The state of being bland : dullness
Mattness, the quality of a painted surface which scatters or absorbs the light falling on it, so as to be substantially free from gloss or sheen
(oenology) Lack of bouquet and freshness of a wine, through too much aeration or infection with film yeasts
(statistics) slim-tailedness or platykurtosis.
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