a grouping of a number of similar things
"a bunch of trees"
"a cluster of admirers"
A group or bunch of several discrete items that are close to each other.
"A dense cluster of wildflowers grew along the edge of the forest path."
In plain English: A cluster is a group of things that grow or sit close together.
"A large cluster of grapes hung from the vine."
Usage: Use "cluster" to describe a collection of separate objects grouped closely together, such as grapes on a vine or stars in the sky. Avoid using it for a single item or a loosely scattered arrangement where the elements are far apart.
come together as in a cluster or flock
"The poets constellate in this town every summer"
To form a cluster or group.
"The small children clustered around the storyteller, eager to hear every word of the tale."
In plain English: To cluster means to gather together in a tight group.
"The small towns clustered together along the river valley."
Usage: Use the verb cluster to describe when separate items gather closely together in a compact group, such as grapes clustering on a vine. Avoid using it when referring to abstract concepts that simply accumulate over time without physical proximity.
The word cluster comes from Old English, originally referring to a bunch or compact mass before entering Middle English with similar meanings. It likely shares a common root with the word clot and was later adapted into modern usage as both a noun for a group of things and a verb describing the action of growing in such groups.