/ Dictionary / Index N natural number: Meaning and Definition of Find definitions for: nat'ural num'ber Pronunciation: [key] a positive integer or zero. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. naturally natural parent Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language