Density /(dĕn"sĭ*ty̆)/

Den·si·ty

Density

n.
  1. The quality of being dense, close, or thick; compactness; -- opposed to rarity.
  2. The ratio of mass, or quantity of matter, to bulk or volume, esp. as compared with the mass and volume of a portion of some substance used as a standard. (Physics)
  3. Depth of shade. (Photog.)