/ Dictionary / Index I -itious: Meaning and Definition of Find definitions for: -itious Pronunciation: [key] a compound suffix occurring in adjectives of Latin origin (adventitious) and with adjectives, formed in Latin or English, associated with nouns ending in -ition (ambitious; expeditious). Cf. -ite, Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. -ition -itis Related Content Daily Word Quiz: wary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language