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1. In general usage a cluster is a number of similar things which are grouped together. For example a cluster of stars or a set of events grouped by date and/or geographic location.
2. A number of linked computers, which work together and can appear and be treated in some respects as though they were a single computer.

Also known as clustering.

3. The smallest amount of space that is allocated on a disk for a file or folder. The cluster size is fixed when a disk is formatted, and may vary between systems as a function of disk size, operating system, file system type (e.g. FAT or NTFS).

cf cluster size.

For more information see: