/ 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: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language