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Meaning of lower bound

low'er bound'

Pronunciation: (lō'ur), [key]
— Math. Math.
  1. an element less than or equal to all the elements in a given set: The numbers 0 and 1 are lower bounds of the set consisting of 1, 2, and 3.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.