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English definition of “cluster”

cluster

noun [C]     /ˈklʌstər/
a group of similar things that are close together in a small area : There is a cluster of hi-tech businesses in the city's industrial park .
a group of similar events that happen within a small area or among a small group of people : The study will look at an apparent cancer cluster among workers at the factory .
IT a group of computers connected together to work as one larger computer and to improve their performance
(Definition of cluster noun from the Cambridge Business English Dictionary © Cambridge University Press)
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