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Webster's Dictionary (1865)

Dĕn'si-ty, n.

noun

n. [Lat. densitas, Fr. densité, Sp. densidad, Pg. densidade, It. densità. See DENSE.]

  1. The quality of being dense, close, or thick; compactness; — opposed to rarity.
  2. (Physics.) The proportion of mass, or quantity of matter, to bulk or volume; thus, a body having twice the quantity of matter of another of the same bulk is said to have twice its density.