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| Meta Title | BROWNIAN MOTIONS Definition & Meaning - Merriam-Webster |
| Meta Description | The meaning of BROWNIAN MOTION is a random movement of microscopic particles suspended in liquids or gases resulting from the impact of molecules of the surrounding medium âcalled also Brownian movement. |
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âBrownian motion.â Merriam-Webster.com Dictionary , Merriam-Webster, https://www.merriam-webster.com/dictionary/Brownian%20motion. Accessed 10 Oct. 2025. |
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Est. 1828
[Dictionary](https://www.merriam-webster.com/dictionary/brownian%20motions)
- [ Definition ](https://www.merriam-webster.com/dictionary/brownian%20motions#dictionary-entry-1)
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# Brownian motion
## [noun](https://www.merriam-webster.com/dictionary/noun)
Brown¡âian motion [ËbrauĚ-nÄ-Én- ](https://www.merriam-webster.com/dictionary/Brownian%20motion?pronunciation&lang=en_us&dir=b&file=browni01 "How to pronounce Brownian motion (audio)")
**:** a random movement of microscopic particles suspended in liquids or gases resulting from the impact of molecules of the surrounding medium
called also Brownian movement
## Examples of *Brownian motion* in a Sentence
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. [Read More](https://www.merriam-webster.com/dictionary/brownian%20motions) Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. [Send us feedback](https://docs.google.com/forms/d/1GAQr3Kn1cURCVHUA82hAga1Wv8DCH0IuqDLRUrOpN7M/viewform?ts=63f4f653&entry.1515682415=https://www.merriam-webster.com/dictionary%2FBrownian%20motion).
What looks like *Brownian motion*, random and chaotic, is in fact as efficient a system of transportation as there is. âBryan C. Donohue, *Baltimore Sun*, 17 Apr. 2024 But another is that at galactic scales, the acceleration due to gravity can vary by a small but random amount, as if spacetime were eliciting some kind of *Brownian motion* on the masses within it. âThe Physics Arxiv Blog, *Discover Magazine*, 11 Mar. 2024 But thereâs another kind of movement available in liquids that has rarely been considered for this purposeâmolecular thermal motion or *Brownian motion*. â*IEEE Spectrum*, 27 Oct. 2023 Brown noise gets its name not from the color, but because itâs produced by a type of random movement known as *Brownian motion*. âSamantha Vincenty, *SELF*, 12 Aug. 2022
## Word History
Etymology
Robert *Brown* â 1858 Scottish botanist
First Known Use
1849, in the meaning defined [above](https://www.merriam-webster.com/dictionary/brownian%20motions#h1)
Time Traveler
The first known use of *Brownian motion* was in 1849
[See more words from the same year](https://www.merriam-webster.com/time-traveler/1849?src=defrecirc-timetraveler-etycard)
## Rhymes for *Brownian motion*
- [locomotion](https://www.merriam-webster.com/dictionary/locomotion)
- [commotion](https://www.merriam-webster.com/dictionary/commotion)
- [demotion](https://www.merriam-webster.com/dictionary/demotion)
- [devotion](https://www.merriam-webster.com/dictionary/devotion)
- [emotion](https://www.merriam-webster.com/dictionary/emotion)
- [laotian](https://www.merriam-webster.com/dictionary/laotian)
- [promotion](https://www.merriam-webster.com/dictionary/promotion)
- [lotion](https://www.merriam-webster.com/dictionary/lotion)
- [notion](https://www.merriam-webster.com/dictionary/notion)
- [ocean](https://www.merriam-webster.com/dictionary/ocean)
- [potion](https://www.merriam-webster.com/dictionary/potion)
[See All Rhymes for *Brownian motion*](https://www.merriam-webster.com/rhymes/perfect/brownian%20motion)
## Browse Nearby Words
[brown hyena](https://www.merriam-webster.com/dictionary/brown%20hyena)
Brownian motion
[brownie](https://www.merriam-webster.com/dictionary/brownie)
[See all Nearby Words](https://www.merriam-webster.com/browse/dictionary/b/61)
## Cite this Entry
Style
âBrownian motion.â *Merriam-Webster.com Dictionary*, Merriam-Webster, https://www.merriam-webster.com/dictionary/Brownian%20motion. Accessed 10 Oct. 2025.
[Copy Citation](https://www.merriam-webster.com/dictionary/brownian%20motions)
## Share
## Kids Definition
Brownian motion
noun
Brown¡âian motion [ËbrauĚ-nÄ-Én- ](https://www.merriam-webster.com/dictionary/Brownian%20motion?pronunciation&lang=en_us&dir=b&file=browni01 "How to pronounce Brownian motion (audio)")
**:** a random movement of microscopic particles in liquids or gases that results from collisions with molecules of the fluid surrounding the particles
called also Brownian movement
Etymology
named for Robert *Brown* 1773â1858 Scottish scientist
## Medical Definition
Brownian motion
noun
Brown¡âian motion [ËbrauĚ-nÄ-Én- ](https://www.merriam-webster.com/dictionary/Brownian%20motion?pronunciation&lang=en_us&dir=b&file=browni01 "How to pronounce Brownian motion (audio)")
**:** a random movement of microscopic particles suspended in liquids or gases resulting from the impact of molecules of the fluid surrounding the particles
called also Brownian movement
## More from Merriam-Webster on *Brownian motion*
Britannica.com: [Encyclopedia article about *Brownian motion*](https://www.britannica.com/EBchecked/topic/81815/Brownian-motion)
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