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 platykurticity