Breadcrumb Home > Dictionary > Index I Ionian Sea: Meaning and Definition of Find definitions for: Io'nian Sea' Pronunciation: [key] an arm of the Mediterranean between S Italy, E Sicily, and Greece. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Ionian mode ionic ✖ Related Content Daily Word Quiz: derogate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language