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English definition of “cluster”

cluster

noun [C]     /ˈklʌs.tər/ US  /-tɚ/
[+ sing/pl verb] a group of similar things that are close together, sometimes surrounding something: Have a look at the cluster of galaxies in this photograph. There was a cluster of fans around him, asking for autographs.Groups and collections of thingsVariety and mixtures specialized phonetics a group of two or more consonant sounds that are together and have no vowel sound between them: The /str/ at the beginning of "stray" is a cluster. cluster     verb [I] People clustered around the noticeboard to read the exam results.Forming groups (of people)
(Definition of cluster noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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