# density

noun den·si·ty \ ˈden(t)-sə-tē \
Updated on: 8 Jan 2018

## Definition of density

plural densities
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 volume (see 1volume 2), unit area (see area 1), or unit length: such as
a chemistry : the mass (see 2mass 1c) of a substance per unit volume
b chemistry : the distribution of a quantity (such as mass, electricity, or energy) per unit usually of space (such as length, area, or volume)
c : the average number of individuals or units per space unit
• 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 2) of a translucent medium
• the fog's density
b : the common logarithm of the opacity

## Examples of density in a Sentence

1. We were surprised by the fog's density.

2. the density of her writing style

3. These instruments are used for measuring the density of the atmosphere.

## Recent Examples of density from the Web

• Osteoporosis, or a loss of bone density, occurs naturally with age and can also be accelerated when women go through menopause.
• Good weather combined with the perfect amount of urban density and great roads are determining factors, too.
• Commissioner Tom Fallon said the density of the property is high.
• This new information was combined with data from 17 previous estimates of tiger population density.
• And data from previous studies had to be recalculated in order to standardize estimates of tiger density.
• At this level of pixel density, such small differences matter for the overall effect.
• The stands at Stub Stewart average 450 trees per acre, officials said in a news release, while the ideal density is 150 trees per acre.
• Those who study what these shifts will mean view the coming era of urban mega-density with both excitement and fear.

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.

see dense

## density

noun den·si·ty \ ˈden-sə-tē \

## Definition of density for Students

plural densities
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

## density

noun den·si·ty \ ˈden(t)-sət-ē, -stē \

## medical Definition of density

plural densities
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
2 a : the degree of opacity of a translucent medium
b

## Seen and Heard

What made you want to look up density? Please tell us where you read or heard it (including the quote, if possible).

### Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

#### bespoke

play

Get Word of the Day daily email!

#### BROWSE DICTIONARY

What's That From? A Word Origin Quiz

• What language gave the word robot to English?

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

### Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

#### Words at Play

##### Is It 'Astrology' or 'Astronomy'?

The difference is written in the stars.

##### Galaxy Brain: Words for Thought and Thinking

What's (another word for) the big idea?

##### Is It 'Hurtle' or 'Hurdle'?

You can do both, but they're not the same

##### 9 More Top-Shelf Drinking Words

Let's have another round tonight.

##### 2017 Word of the Year: Behind the Scenes

How we chose 'feminism'

##### Words of the Year: 1066

Or, Why Pig Meat is Called 'Pork' and Cow Meat is Called 'Beef'

##### Irregardless

It is in fact a real word (but that doesn't mean you should use it).

##### Weird Plurals

One goose, two geese. One moose, two... moose. What's up with that?

#### Word Games

Who'd a thunk?

Take the quiz
##### Spell It

Can you spell these 10 commonly misspelled words?

Take the quiz
##### Word Winder's CrossWinder

A game of winding words.

Play the game