: a number of similar things that occur together: such as
a
: two or more consecutive consonants or vowels in a segment of speech
b
: a group of buildings and especially houses built close together on a sizable tract in order to preserve open spaces larger than the individual yard for common recreation
c
: an aggregation of stars or galaxies that appear close together in the sky and are gravitationally associated
the Perseus cluster of galaxies
d
: a larger than expected number of cases of disease (such as leukemia) occurring in a particular locality, group of people, or period of time
e
: a number of computers networked together in order to function as a single computing system
Consisting of groups of inexpensive machines cobbled together, clusters in many ways have supplanted traditional supercomputers. Elizabeth K. Wilson

cluster

2 of 2

verb

transitive verb

1
: to collect into a cluster
cluster the tents together
2
: to furnish with clusters
the bridge was clustered with men and officers Herman Wouk

intransitive verb

: to grow, assemble, or occur in a cluster
they clustered around the fire

Examples of cluster in a Sentence

Noun a cluster of cottages along the shore A small cluster of people had gathered at the scene of the accident. Verb The children clustered around the storyteller. the mice clustered together into a small burrow
Recent Examples on the Web
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Noun
Using some of the resources from High-Flyer, which by 2019 managed over $10 billion in assets, Liang developed a cluster of 10,000 of the Nvidia A100 GPU chips in 2022 before U.S. export restrictions took effect. Bryan Penprase, Forbes, 13 Mar. 2025 Meanwhile, her second ring, given to her by Timothy Laurence—her husband of more than 30 years—features an oval-cut cabochon sapphire with a cluster of three diamonds on either side. Hayley Maitland, Vogue, 13 Mar. 2025
Verb
As might be expected, many of the orange spots were clustered around downtown. Jim Woods, Chicago Tribune, 14 Mar. 2025 Experts say the four recent accidents should not be viewed as a systemic, nationwide problem, but rather as four random events that happened to cluster together in time. Jeffrey Kluger, TIME, 11 Feb. 2025 See All Example Sentences for cluster

Word History

Etymology

Noun and Verb

Middle English, from Old English clyster; akin to Old English clott clot

First Known Use

Noun

before the 12th century, in the meaning defined above

Verb

14th century, in the meaning defined at transitive sense 1

Time Traveler
The first known use of cluster was before the 12th century

Browse Nearby Words

Cite this Entry

“Cluster.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/cluster. Accessed 20 Mar. 2025.

Kids Definition

cluster

1 of 2 noun
: a number of similar things growing, collected, or grouped together : bunch
a cluster of houses
a flower cluster

cluster

2 of 2 verb
: to grow, collect, or gather in a cluster

Medical Definition

: a larger than expected number of cases of disease (as leukemia) occurring in a particular locality, group of people, or period of time

More from Merriam-Webster on cluster

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