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cluster Syllabification: clus·ter
Pronunciation: /ˈkləstər/

Definition of cluster in English:


1A group of similar things or people positioned or occurring closely together: clusters of creamy-white flowers a cluster of antique shops
More example sentences
  • Botrytis bunch rot is especially severe in grape cultivars with tight, closely packed clusters of fruit.
  • White lights entwined with silver ribbon draped the window sills, door frames, and banister, bunched with clusters of holly and mistletoe.
  • Blooms appeared in long clusters of densely packed white flowers.
bunch, clump, mass, knot, group, clutch, bundle, truss
crowd, group, knot, huddle, bunch, throng, flock, pack, band
informal gang, gaggle
1.1 Astronomy A group of stars or galaxies forming a relatively close association.
Example sentences
  • There is a higher proportion of elliptical and fast-rotating spiral galaxies in dense clusters than in small groups.
  • A double star cluster in a satellite galaxy of the Milky Way is pictured above.
  • Caroline also compiled catalogs of star clusters and nebulae.
1.2 Linguistics (also consonant cluster) A group of consonants pronounced in immediate succession, as str in strong.
Example sentences
  • Consonants regularly occur in strings or clusters without intervening vowels: initially, as in stain and strip, finally, as in fetch and twelfth, medially, as in dodging.
  • … if one chooses the Latin, French, or Italian language, since German is much more difficult because of its many closed syllables and consonant clusters.
  • Thus, our strong emphasis on onset clusters succeeded in inducing a small but reliable transfer effect.
1.3A natural subgroup of a population, used for statistical sampling or analysis.
Example sentences
  • We also recruited a large number of clusters and performed statistical analyses taking cluster randomisation into account.
  • Using cluster analysis, a statistical method that determines subpopulations in a group, three distinct patterns of behavior emerged.
  • This difference was significant, even in the rigorous statistical analysis for the cluster level design, controlling for confounding variables.
1.4 Chemistry A group of atoms of the same element, typically a metal, bonded closely together in a molecule.
Example sentences
  • In metallic clusters, the metal atoms are either directly bonded through metal-metal interactions or are bridged by appropriate ligands.
  • These clusters were once separate molecules, called amino acids.
  • Nevertheless, there were no significantly supported clusters including molecules from both vertebrates and invertebrates.


[no object] Back to top  
1Be or come into a cluster or close group; congregate: the children clustered around her skirts
More example sentences
  • The crowd clustered round the sandy square was yelling encouragement at the players, who frowned in concentration in the fading light.
  • We got back to find a huge crowd of people clustered around his desk whispering and giggling.
  • Inevitably, most of the early morning shoppers clustered around the road, trying to get a look at what was going on.
congregate, gather, collect, group, assemble;
1.1 Statistics (Of data points) have similar numerical values: students tended to have scores clustering around 70 percent
More example sentences
  • Although there were outliers, the majority of the data points clustered around the population mean.
  • In both analyses, we computed robust standard errors adjusted for clustering at the firm level.
  • However, while a few genes do show rather high transition bias, most of the estimates cluster tightly around the median value.


Old English clyster; probably related to clot.

Words that rhyme with cluster

adjuster, Augusta, bluster, buster, Custer, duster, fluster, lustre (US luster), muster, thruster, truster

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