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Meaning of cluster point

clus'ter point"

Pronunciation: [key]
— Math. Math.
  1. a point of a net having the property that the net is frequently in each neighborhood of the point.
  2. See
  3. a point of a filter having the property that every neighborhood of the point has points in common with every set in the filter.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.