/ Dictionary / Index I Iona: Meaning and Definition of Find definitions for: I•o•na Pronunciation: (ī-ō'nu), [key] — n. an island in the Hebrides, off the W coast of Scotland: center of early Celtic Christianity. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ion ion chamber Related Content Daily Word Quiz: acquiesce Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language