From Middle English cluster, from Old English cluster, clyster (“cluster, bunch, branch”), from Proto-Germanic *klus-, *klas- (“to clump, lump together”) + Proto-Germanic *-þrą (instrumental suffix), related to Low German Kluuster (“cluster”), Dutch dialectal klister (“cluster”), Swedish kluster (“cluster”), Icelandic klasi (“cluster; bunch of grapes”).
cluster (plural clusters)
- A group or bunch of several discrete items that are close to each other.
- A cluster of flowers grew in the pot.
- 1907, Harold Bindloss, chapter 7, The Dust of Conflict:
- Then there was no more cover, for they straggled out, not in ranks but clusters, from among orange trees and tall, flowering shrubs […] ,
- 2011 December 29, Keith Jackson, “SPL: Celtic 1 Rangers 0”, Daily Record:
- Charlie Mulgrew’s delicious deadball delivery was attacked by a cluster of green and white shirts at McGregor’s back post but Ledley got up higher and with more purpose than anyone else to thump a header home from five yards.
- (astronomy) A group of galaxies or stars that appear near each other.
- The Pleiades cluster contains seven bright stars.
- (music) A secundal chord of three or more notes.
- (phonetics) A group of consonants.
- The word "scrub" begins with a cluster of three consonants.
- (computing) A group of computers that work together.
- (computing) A logical data storage unit containing one or more physical sectors (see block).
- (statistics) A significant subset within a population.
- (military) Set of bombs or mines.
- (army) A small metal design that indicates that a medal has been awarded to the same person before.
Derived terms 
group or bunch of something
- Armenian: բույլ (hy) (buyl)
- Bulgarian: грозд (bg) (grozd) m, кичур (bg) (kičur) m, китка (bg) (kitka) f
- Mandarin: 簇 (cmn) (cù), 束 (cmn) (shù), 串 (cmn) (chuàn), 群 (cmn) (qún), 堆 (cmn) (duī), 叢 (cmn), 丛 (cmn) (cóng), 团 (cmn) (tuán), 塊 (cmn), 块 (cmn) (kuài)
- Czech: shluk (cs) m
- Danish: klynge (da) c, klase (da) c, sværm (da) c
- Finnish: ryhmä, rykelmä, parvi, kimppu, terttu, ryväs (fi)
- French: (group) groupe (fr) m, (cluster) grappe (fr) f
- German: Anhäufung (de) f, Büschel (de) m, Gruppe (de) f, Haufen (de) m, Schwarm (de) m, Traube (de) m
- Irish: braisle (ga) f
- Sorani: دهسته (ku) (deste), هێشوو (ku) (héshu)
- Low German: Kluuster (nds)
- Persian: كلاستر (fa) (گروه، خوشه)
- Russian: (grapes) гроздь (ru) (grozd') f, (grapes) кисть (ru) (kist') f, пучок (ru) (pučók) m, (bees) рой (ru) (roj) m, скопление (ru) (skoplénije) n
- Spanish: racimo (es) m, amontonamiento (es) m
group of galaxies or stars
chord of three or more notes
group of computers working together
significant subset within a population
- The translations below need to be checked and inserted above into the appropriate translation tables, removing any numbers. Numbers do not necessarily match those in definitions. See instructions at Help:How to check translations.
Translations to be checked
cluster (third-person singular simple present clusters, present participle clustering, simple past and past participle clustered)
- (intransitive) To form into a cluster.
- The children clustered together around the puppy.