Main Entry:: ¹clus·ter
Pronunciation:: \ˈkləs-tər\
Function:: noun
Etymology:: Middle English, from Old English clyster; akin to Old English clott clot
Date:: before 12th century

: a number of similar things that occur together: as a: two or more consecutive consonants or vowels in a segment of speech b: a group of buildings and especially houses built close together on a sizable tract in order to preserve open spaces larger than the individual yard for common recreation c: an aggregation of stars or galaxies that appear close together in the sky and are gravitationally associated d: a larger than expected number of cases of disease (as leukemia) occurring in a particular locality, group of people, or period of time

— clus·tery

\-t(ə-)rē\ adjective

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