fluidity

American  

[floo-id-i-tee] / fluˈɪd ɪ ti /

noun

• fluidities
  plural

1. the quality or state of being fluid.

2. Physics.

   1. the ability of a substance to flow.

   2. a measure of this ability, the reciprocal of the coefficient of viscosity.

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fluidity British  

/ fluːˈɪdɪtɪ /

noun

1. the state of being fluid

2. physics the reciprocal of viscosity

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Other Word Forms

Derived Forms

• nonfluidity
  noun

Inflected Forms

Nouns

• fluidities
  plural

Etymology

Origin of fluidity

First recorded in 1595–1605; fluid + -ity

Explanation

Fluidity is a quality of being graceful or flowing, like the fluidity of a dancer's movements. Things that move with easy, smooth motions have fluidity — think of clouds moving across the sky on a windy day, or the way a modern dancer's body moves. This adjective can also mean "changeable," like the fluidity of ideas being exchanged during a high school debate class. As a physical quality, you might also describe the fluidity of any substance that's fluid, or behaves like a liquid.

Example Sentences

See Examples For:

fluidity fluidities

Earlier in the week, CN struck two separate commercial agreements with Union Pacific aimed at expanding cross-border freight capacity and improving network fluidity across North America.

From The Wall Street Journal ● Jul. 24, 2026

Under Pochettino, the U.S. approach was defined by an aggressive pressing system and tactical fluidity, with the team building from a back-three structure that freed its wing backs to exploit overloads when pushing forward.

From Los Angeles Times ● Jul. 12, 2026

These changes have been impressive to witness in real time and what really stands out is that Deschamps has retained a level of fluidity while adapting the system.

From BBC ● Jun. 30, 2026

In yellow, you see the five areas of the pitch PSG look to occupy at all times while there is more fluidity for the players positioned in the midfield areas.

From BBC ● May 30, 2026

A vast seething, hot world of fluidity, and Rine the rascal was at home.

From "Invisible Man" by Ralph Ellison

Gerwig’s “Little Women” leans into the book’s fluidities and contradictions, especially among the characters themselves, who are self-sacrificing and ethereal one moment and graspingly materialistic the next.

From Washington Post ● Dec. 18, 2019

His hands pass over the keys and he produces Chopin-like fluidities.

From Confessions of a Young Man by George (George Augustus) Moore