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a group of similar things or people positioned or occurring closely together:clusters of creamy-white flowers a cluster of antique shops Astronomy a group of stars or galaxies forming a relatively close association. Linguistics (also consonant cluster) a group of consonants pronounced in immediate succession, as str in strong. a natural subgroup of a population, used for statistical sampling or analysis. Chemistry a group of atoms of the same element, typically a metal, bonded closely together in a molecule.
verb [no object]
be or come into a cluster or close group; congregate:the children clustered around her skirts Statistics (of data points) have similar numerical values:students tended to have scores clustering around 70 percent