/ Dictionary / Index C Catherine of Siena: Meaning and Definition of Find definitions for: Cath'erine of Sie'na Pronunciation: [key] 1347–80, Italian ascetic and mystic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Catherine of Aragon Catherine Parr Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language