/ Dictionary / Index I I.W.: Meaning and Definition of Find definitions for: I.W. Pronunciation: [key] Isle of Wight. i.w. Pronunciation: [key] inside width. isotopic weight. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: iw (Thesaurus) ivy vine Iwaki Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language