A cluster is a small group of people or things. When you and your friends huddle awkwardly around the snack table at a party, whispering and trying to muster enough nerve to hit the dance floor, you’ve formed a cluster.

Cluster comes to us from the Old English word clyster, meaning bunch. Nowadays, you can use cluster as either a noun or a verb. When we were kids, we would stand in a cluster (noun) on the street corner, eagerly awaiting the appearance of the Good Humor truck every afternoon. Then we would cluster (verb) eagerly around the driver, demanding ice cream. Virtually anything can form a cluster — flowers, cells, stars, human beings, and even events.

Definitions of cluster

n a grouping of a number of similar things

“a cluster of admirers”
bunch, clump, clustering
Northern Cross
a cluster of 5 bright stars forming a cross in the constellation Cygnus
Omega Centauri
a global cluster in the constellation Centaurus
a star cluster in the constellation Taurus
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a tight cluster of people or things
a bunch
tuft, tussock
a bunch of hair or feathers or growing grass
a small tuft or lock
hexenbesen, staghead, witch broom, witches' broom
an abnormal tufted growth of small branches on a tree or shrub caused by fungi or insects or other physiological disturbance
(botany) a usually terminal tuft of bracts (as in the pineapple) or tuft of hairs (especially on certain seeds)
Type of:
a jumbled collection or mass

v gather or cause to gather into a cluster

bunch, bunch up, bundle, clump
form into one cluster
Type of:
assume a form or shape

v come together as in a cluster or flock

clump, constellate, flock
huddle, huddle together
crowd or draw together
bunch, bunch together, bunch up
form into a bunch
Type of:
assemble, foregather, forgather, gather, meet
collect in one place

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