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cluster

/ˈklʌstər/

A tight group of things close together

From O.English / Proto-Germanic clot (a lump).

noun
verb
clot
Old English
clyster
a number of things growing naturally together
Middle English
cluster
generalized to a close group of persons or things
Modern English
cluster
used for groups in nature, science, and language
Modern English
cluster

A cluster begins as a lump. Old English had clyster for things that grew tightly together, and etymologists think it probably belonged to the same earthy family as clot: not sleek, not elegant, just a compact mass. That makes the word feel almost physical, as if you could pick it up with two fingers. By the late 1300s it could describe people huddled together; by 1727 it was being used for stars, which is a wonderful upgrade from mud to Milky Way. The same family gives English a whole vocabulary of sticking-together—clot, clod, clump, clump-like shapes—and cluster is the tidy name for the moment separate things decide to act like one object.

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