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Look up cluster in Wiktionary, the free dictionary.

Cluster(s) may refer to:

Science and technology

Cluster (spacecraft), constellation of four European Space Agency spacecraft
Cluster II (spacecraft), a European Space Agency mission to study the magnetosphere
Asteroid cluster, a small asteroid family
Galaxy cluster, large gravitationally bound groups of galaxies, or groups of groups of galaxies
Supercluster, the largest gravitationally bound objects in the universe, composed of many galaxy clusters
Star cluster
- Globular cluster, a spherical collection of stars whose orbit is either partially or completely in the halo of the parent galaxy
- Open cluster, a spherical collection of stars that orbits a galaxy in the galactic plane

Cancer cluster, in biomedicine, an occurrence of a greater-than-expected number of cancer cases
Cluster headache, a neurological disease that involves an immense degree of pain
Cluster of differentiation, protocol used for the identification and investigation of cell surface molecules present on white blood cells
Winter cluster, in beekeeping, a well-defined cluster of honey bees in cold temperatures
Disease cluster, a grouping of cases of disease
Gene cluster, a group of genes (or proteins, or metabolites) whose expression or concentration is similar across a range of conditions
Cluster of microorganisms, as in a colony

Cluster analysis, a set of techniques for grouping a set of objects based on intrinsic similarities
Cluster sampling, a sampling technique used when "natural" groupings are evident in a statistical population
Cluster graph, in graph theory, a disjoint union of complete graphs
Clusterable graph, in balance theory
Cluster algebra, a class of commutative rings used in representation theory
Cluster expansion, a technique in statistical mechanics and quantum field theory

CLUSTER, the Consortium Linking Universities of Science and Technology for Education and Research
Cluster (physics), a small group of atoms or molecules
Cluster chemistry, an array of bound atoms intermediate in character between a molecule and a solid
Consonant cluster, in linguistics
Language cluster or dialect cluster, a geographic distribution of languages

Tone cluster, a musical chord comprising at least three consecutive tones in a scale
Cluster (album), the 1971 eponymous album by the band Cluster
Cluster (band), a German electronic group
"Cluster", a track from the album Ben Bu Sarkiyi Sana Yazdim by Cem Adrian
"Cluster", a song by P-Model from the album Big Body
Cluster One, the first track on Pink Floyd's 1994 album The Division Bell
"Cluster", an extended play by the pop-punk band Waterparks

Business cluster, a geographic cluster of competitive businesses
Research-intensive cluster, a region with a high density of research-oriented organizations
Cluster home, a type of housing development

Cluster, Pleasants County, West Virginia
Cluster diagram, general type of diagram, which represents some kind of cluster
Clusterfuck or cluster, slang term for a messy situation, arising in the US Marine Corps
Clusters School of Digital Arts, an animation and visual effects training school