/ Dictionary / Index P perseity: Meaning and Definition of Find definitions for: per•se•i•ty Pronunciation: (pur-sā'i-tē, -sē'-), [key] — n. (in medieval philosophy) the quality of those things having substance independently of any real object. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Perseid Persephone 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