den·​si·​ty | \ ˈden(t)-sə-tē How to pronounce density (audio) \
plural densities

Definition of density

1 : the quality or state of being dense measures of traffic density the density of the cake felt that the candidate's density on the subject of equality was alarming the density of her prose
2 mathematics : the quantity per unit of volume (see volume entry 1 sense 2), unit of area (see area sense 1), or unit of length: such as
a chemistry : the mass (see mass entry 2 sense 1c) of a substance per unit of volume pure iron has a density of 7.8 grams per cubic centimeter
b chemistry : the distribution of a quantity (such as electricity or energy) per unit usually of space (such as length, area, or volume) The drawback to using ethanol as a complete replacement for gasoline, however, is not only the high cost of its production from cellulose but also its lower energy density.— John R. Regalbuto
c : the average number of individuals or units per unit of space a population density of 500 per square mile a housing density of 10 houses per acre
3 physics
a : the degree of opacity (see opacity sense 2) of a translucent medium the fog's density
b : the common logarithm of the opacity

Examples of density in a Sentence

We were surprised by the fog's density. the density of her writing style These instruments are used for measuring the density of the atmosphere.
Recent Examples on the Web To maximize the new bot’s energy density, the team created a 30-gram device whose whole body acts as the spring. Sophie Bushwick, Scientific American, 27 Apr. 2022 Much of the beauty of this album is created through the carefully balanced layers of sound, the rich density of the instrumentation delivers an impactful and delightfully eclectic listening experience. Grace Ann Natanawan, SPIN, 27 Apr. 2022 Instead, series creator Miyazaki decided to sharpen his focus on the most engaging aspects of a role-playing adventure, including the feel of every combat scenario and the density and detail of the environments. Washington Post, 26 Apr. 2022 And with so much development focused on battery technology right now, the energy density is constantly increasing. Bradley Iger, Ars Technica, 22 Apr. 2022 After many laps around the collider, the bunch eventually depletes enough that the total number of protons drops, and the density of protons drops. Manasee Wagh, Popular Mechanics, 22 Apr. 2022 This is largely so because the population density of these regions enables a quicker spread of covid-19. Manavi Kapur, Quartz, 18 Apr. 2022 The density of the puns and the breakneck pace of their delivery, combined with the visual cacophony of the set design, might compel you to watch it on loop. Elvia Wilk, The New York Review of Books, 23 Mar. 2022 Of course, this just gives the average density for Earth. Rhett Allain, Wired, 14 Mar. 2022 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'density.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of density

1598, in the meaning defined at sense 1

History and Etymology for density

see dense

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Time Traveler for density

Time Traveler

The first known use of density was in 1598

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Dictionary Entries Near density



density altitude

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Statistics for density

Last Updated

21 May 2022

Cite this Entry

“Density.” Dictionary, Merriam-Webster, Accessed 26 May. 2022.

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More Definitions for density


den·​si·​ty | \ ˈden-sə-tē How to pronounce density (audio) \
plural densities

Kids Definition of density

1 : the condition of having parts that are close together the jungle's density
2 : the amount of something in a specified volume or area high population density


den·​si·​ty | \ ˈden(t)-sət-ē, -stē How to pronounce density (audio) \
plural densities

Medical Definition of density

1 : the quantity per unit volume, unit area, or unit length: as
a : the mass of a substance per unit volume
b : the distribution of a quantity (as mass, electricity, or energy) per unit usually of space
c : the average number of individuals or units per space unit a population density of 500 per square mile
2a : the degree of opacity of a translucent medium

More from Merriam-Webster on density

Nglish: Translation of density for Spanish Speakers

Britannica English: Translation of density for Arabic Speakers Encyclopedia article about density


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