ETYM AS. cluster, clyster; cf. LG. kluster (also Swed. and Dan. klase a cluster of grapes, Dutch klissen to be entangled?.).
1. A number of things of the same kind growing together; a bunch.
2. A number of similar things collected together or lying contiguous; a group.
3. A number of individuals grouped together or collected in one place; a crowd; a mob.
In music, the effect of playing simultaneously and without emphasis all the notes within a chosen interval. It was introduced by US composer Henry Cowell in the piano piece The Banshee 1925, for which using a ruler on the keys is recommended. Its use in film and radio incidental music symbolizes a hallucinatory or dreaming state, presumably because it resembles an internalized disturbance of normal hearing.
The cluster effect is also heard in Ecuatorial 1933–34 by Varčse, Stockhausen’s Piano Piece X 1961, and Ligeti’s Volumina 1962 for organ, using the player’s forearms. Cluster writing for strings features in Penderecki’s Threnody for the Victims of Hiroshima 1960, and for voices in Ligeti’s Lux Aeterna.
1. An aggregation, such as a group of data points on a graph.
2. A communications computer and its associated terminals.
3. In data storage, a disk-storage unit consisting of a fixed number of sectors (storage segments on the disk) that the operating system uses to read or write information; typically, a cluster consists of two to eight sectors, each of which holds a certain number of bytes (characters).
4. A group of independent network servers that operate—and appear to clients—as if they were a single unit. A cluster network is designed to improve network capacity by, among other things, enabling the servers within a cluster to shift work in order to balance the load. By enabling one server to take over for another, a cluster network also enhances stability and minimizes or eliminates downtime caused by application or system failure.
A named collection of catalogs.
To come together as in a cluster or flock; SYN. constellate, flock, clump.