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.

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.