fluidity

American  

[floo-id-i-tee] / fluˈɪd ɪ ti /

noun

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

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

The fluidity of the situation in the Middle East is a wildcard for Singapore’s economy.

From The Wall Street Journal • May 26, 2026

“By being called ‘member of technical staff,’ there can be more fluidity of engineers doing more research work, researchers writing more code, or people going in between.

From MarketWatch • May 9, 2026

This fluidity appears hard to understand, but there are underlying principles from the coaches that enable it to work without descending into chaos.

From BBC • Apr. 28, 2026

The design team, responding to the work’s fluidity, enjoys keeping us in the dark before ambushing us with unasked-for surprises.

From Los Angeles Times • Apr. 22, 2026

Lazlo stood rooted, experiencing the full meaning of useless as a wave of enemies hurtled toward them, moving with uncanny fluidity, flying at them as though launched.

From "Strange the Dreamer" by Laini Taylor