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Cluster analysis or clustering is the task of grouping a set of objects in such a way that objects in the same group (called a cluster) are more similar (in some sense or another) to each other than to those in other groups (clusters).
Princeton's WordNet(4.00 / 2 votes)Rate this definition: 1  bunch, clump, cluster, clustering(verb) a grouping of a number of similar things. 2  cluster, constellate, flock, clump(verb) come together as in a cluster or flock. 3  bunch, bunch up, bundle, cluster, clump(verb) gather or cause to gather into a cluster.