/ Dictionary / Index N natural immunity: Meaning and Definition of Find definitions for: nat'ural immu'nity Pronunciation: [key] immunity that is present without prior immunization. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. natural history naturalism Related Content Daily Word Quiz: diligent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language