/ Dictionary / Index C Cassini division: Meaning and Definition of Find definitions for: Cassi'ni divi"sion Pronunciation: [key] — Astron. Astron. a 3000-mi. (4800-km) wide dark region that separates the middle and outermost rings of the planet Saturn. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Cassini cassino Related Content Daily Word Quiz: fresco Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language