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cluster

clus·ter/ˈklʌstɚ/noun, verb

cluster is spelled C-L-U-S-T-E-R: 7 letters and 2 syllables (clus·ter). It appears 9.8 times per million words in written English, the 7,224th most frequent word form (wordfreq, 2021 data). As a noun, cluster means “A bunch or group of several discrete items that are close to each other” (English Wiktionary, September 2026). The plural of cluster is clusters.

How many letters and syllables are in cluster?

Letters7: C-L-U-S-T-E-R
Syllables2: clus·ter
In writing9.8 times per million words; the 7,224th most frequent word form
Wrong spellings searchednone measured in search
Rhymes with

Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); rhymes and same-letter words are computed by PlainSpell from its own word list.

How common is cluster?

Cluster appears 9.8 times per million words in written English, the 7,224th most frequent word form in the list.

Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).

How do you pronounce cluster?

  • UK /ˈklʌstə/
  • US /ˈklʌstɚ/

Cluster has 2 syllables, split clus·ter in writing.

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: LL-Q1860_(eng)-Vealhurl-cluster.wav, Wikimedia Commons (author and licence on each file's page).

What rhymes with cluster?

8 words on PlainSpell end in the same sounds as cluster from its last stressed vowel (/ʌstəɹ/):

Computed by PlainSpell from the pronunciations in the English Wiktionary (dump of September 2, 2026): a rhyme shares every sound from the last stressed vowel to the end; ordered by written frequency (wordfreq 3.1).

Forms of cluster

  • clusters plural, present, singular, he/she/it
  • clustering participle, present
  • clustered participle, past, singular, he/she/it, plural

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).

What does cluster mean?

The meanings the English Wiktionary records, quoted as written there (source below).

noun

  1. 1

    A bunch or group of several discrete items that are close to each other.

    a cluster of islands

  2. 2

    A group of galaxies, nebulae, or stars that appear to the naked eye to be near each other.

    The Pleiades cluster contains seven bright stars.

  3. 3

    An ensemble of bound atoms (especially of a metal) or molecules, intermediate in size between a molecule and a bulk solid.

  4. 4

    A group of computers that work together.

  5. 5

    A logical data storage unit containing one or more physical sectors (see block (noun)).

  6. 6

    A group of cases of the same disease occurring around the same place or time.

    A leukemia cluster has developed in the town.

  7. 7

    Synonym of lexical bundle (“a sequence of two or more words that occur in a language with high frequency but are not idiomatic”).

    examples of clusters would include in accordance with, so far, and the results of

  8. 8

    A set of bombs or mines released as part of the same blast.

verb

  1. 1

    To collect (animals, people, objects, data points, etc) into clusters (noun sense 1).

  2. 2

    To cover (with clusters); to scatter or strew in clusters (within); to distribute (objects) within such that they form clusters.

    The sea is clustered with islands.

  3. 3

    To form a cluster or group; to assemble, to gather.

    The children clustered around the puppy.

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).

How do you abbreviate cluster?

Wiktionary records one abbreviation of cluster: CL.

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).

Cluster in Spanish, French, German and Portuguese

LanguageWords
Frenchgroupe (bunch or group of several discrete items that…), grappe, régime (bunch of grapes), amas (group of galaxies, nebulae, or stars that…)
GermanAnhäufung, Büschel, Gruppe, Haufen, Schwarm (bunch or group of several discrete items that…), Traube (bunch of grapes)
Portugueseaglomeração, aglomerado, agrupamento, conjunto (bunch or group of several discrete items that…), cluster (group of computers that work together), aglomerar (to collect (animals, people, or objects) into…)
Spanishaglomeración, agrupamiento, amontonamiento, cluster, clúster, clóster (bunch or group of several discrete items that…)

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.

Where does cluster come from?

The noun is derived from Middle English cluster (“bunch, cluster, spray; compact body or mass, ball”) [and other forms], from Old English cluster, clyster (“cluster, bunch, branch”), from Proto-Germanic *klas-, *klus- (“to clump, lump together”) (possibly from Proto-Indo-European *gel- (“to ball up; to clench; to amass”)) + *-þrą (suffix forming nouns denoting an instrument or tool). The English word is probably a doublet of clot. The verb is derived from the noun.

Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).

What to look up after cluster