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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. 2017.
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Examples from the Web for density
Contemporary Examples
Historical Examples
  • If the density be inversely as the distances, the  periodic times will be equal.

  • We shall see that this is so when we come to deal with the density of the Aether.

    Aether and Gravitation William George Hooper
  • This supposes that the density of the stars in each part of the Galaxy is the same.

    Lectures on Stellar Statistics Carl Vilhelm Ludvig Charlier
  • There was a density to the darkness that almost excluded the penetration of thought.

    Bamboo Tales Ira L. Reeves
  • Beyond this the density sinks to less than 200 per hectare and less than fifty on the outskirts.

    The Argentine Republic Pierre Denis
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 American Heritage® 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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