/ Dictionary / Index P prevention: Meaning and Definition of Find definitions for: pre•ven•tion Pronunciation: (pri-ven'shun), [key] — n. the act of preventing; effectual hindrance. a preventive: This serum is a prevention against disease. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: prevention (Thesaurus) preventer preventive Related Content Daily Word Quiz: penchant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language