The word density
MOST NEARLY means:
  1. the amount of mass of a substance in a given volume; mass per unit volume
  2. a harmful substance in the air, water or soil
  3. the lower part of the thermosphere
  4. the force exerted on a surface divided by the total area over which the force is exerted
  5. a brownish haze that is a mixture of ozone and other chemicals, formed when pollutants react with each other in the presence of sunlight
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