/ Dictionary / Index Q quadri-: Meaning and Definition of Find definitions for: quadri- Pronunciation: [key] a combining form meaning “four,” used in the formation of compound words: quadrilateral. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. quadrennium quadriad Related Content Daily Word Quiz: hale Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language