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.
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.
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 stored on an external storage medium, as disk or tape, or displayed on a CRT or other screen.

1595–1605; < Latin dēnsitās, equivalent to dēns(us) dense + -itās -ity

nondensity, noun
superdensity, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
density (ˈdɛnsɪtɪ)
n , pl -ties
1.  the degree to which something is filled, crowded, or occupied: high density of building in towns
2.  obtuseness; stupidity
3.  See also relative density ρ 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
4.  charge density See current density a measure of a physical quantity per unit of length, area, or volume
5.  physics, photog transmission density See reflection density

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

c.1600, from Fr. densité (16c.), from O.Fr. dempsité (13c.), from L. densitas "thickness," from densus "thick, dense."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
density   (děn'sĭ-tē)  Pronunciation Key 
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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American Heritage
Cultural Dictionary

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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Example sentences
The idea of greater density on college campuses almost always meets with
Various investigators have shown that sound frequencies in this range can
  improve bone density and promote healing.
Instead, it is a measurement used by brewers to track the density of certain
Diesel fuel is heavier, less refined, and has a higher "energy
  density" than gasoline.
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