/ Dictionary / Index I ideo-: Meaning and Definition of Find definitions for: ideo- Pronunciation: [key] a combining form representingin compound words: ideology. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. identity matrix ideogram 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