Noun density has 2 senses
  1. density, denseness - the amount per unit size
    --1 is a kind of compactness
    --1 has particulars: relative density; rarity, tenuity, low density
  2. concentration, density, denseness, compactness - the spatial property of being crowded together
    --2 is a kind of spacing, spatial arrangement
    --2 has particulars: bits per inch, bpi; flux density, flux
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