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Meaning of subbase

sub•base

Pronunciation: (sub'bās"), [key]
— n.
  1. the lowest part of a base, as of a column, that consists of two or more horizontal members.
  2. a collection of subsets of a topological space having the property that every open set of a given topology can be written as the union of intersections of finite numbers of sets in the collection. Cf. (def. 13b).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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