/ Dictionary / Index L lower bound: Meaning and Definition of Find definitions for: low'er bound' Pronunciation: (lō'ur), [key] — Math. Math. 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. Lower Austria Lower Burrell Related Content Daily Word Quiz: hale Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language