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[den-si-tee] /ˈdɛn sɪ ti/
noun, plural densities.
the state or quality of being dense; compactness; closely set or crowded condition.
stupidity; slow-wittedness; obtuseness.
the number of inhabitants, dwellings, or the like, per unit area:
The commissioner noted that the population density of certain city blocks had fallen dramatically.
Physics. mass per unit volume.
  1. the quantity of electricity per unit of volume at a point in space, or the quantity per unit of area at a point on a surface.
  2. current density.
the degree of opacity of a substance, medium, etc., that transmits light.
Photography. the relative degree of opacity of an area of a negative or transparency, often expressed logarithmically.
Computers. a measure of the compactness of data saved on a storage medium, as disk or tape, or displayed on an electronic screen.
Origin of density
1595-1605; < Latin dēnsitās, equivalent to dēns(us) dense + -itās -ity
Related forms
nondensity, noun
superdensity, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for density
Contemporary Examples
Historical Examples
  • The young man tried to be patient over her density in this time of crisis.

    Within the Law Marvin Dana
  • In the second way, density implies compactness of molecules.

    The Machinery of the Universe Amos Emerson Dolbear
  • So if rate of speed and elasticity be known, the density may be computed.

    The Machinery of the Universe Amos Emerson Dolbear
  • In this way the density of the ether has been deduced by noting the velocity of light.

    The Machinery of the Universe Amos Emerson Dolbear
  • The density of their ignorance is something that the people of England cannot understand.

    Ireland as It Is Robert John Buckley (AKA R.J.B.)
British Dictionary definitions for density


noun (pl) -ties
the degree to which something is filled, crowded, or occupied: high density of building in towns
obtuseness; stupidity
a measure of the compactness of a substance, expressed as its mass per unit volume. It is measured in kilograms per cubic metre or pounds per cubic foot ρ See also relative density
a measure of a physical quantity per unit of length, area, or volume See charge density, current density
(physics, photog) See transmission density, reflection density
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for density

c.1600, from French densité (16c.), from Old French dempsité (13c.), from Latin densitas "thickness," from densus "thick, dense" (see dense).

Online Etymology Dictionary, © 2010 Douglas Harper
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density in Medicine

density den·si·ty (děn'sĭ-tē)

  1. The mass per unit volume of a substance at a specified pressure and temperature.

  2. The quantity of something per unit measure, especially per unit length, area, or volume.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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density in Science
A measure of the quantity of some physical property (usually mass) per unit length, area, or volume (usually volume). ◇ Mass density is a measure of the mass of a substance per unit volume. Most substances (especially gases such as air) increase in density as their pressure is increases or as their temperature decreases. ◇ Energy density is a measure of the amount of energy (often in the form of electromagnetic radiation) per unit volume in a region of space or some material. See also Boyle's law.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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density in Culture

density definition

The relative heaviness of objects, measured in units of mass or weight per units of volume. (See specific gravity.)

The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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