/ Dictionary / Index Q quadratic: Meaning and Definition of Find definitions for: quad•rat•ic Pronunciation: (kwo-drat'ik), [key] — adj. square. involving the square and no higher power of the unknown quantity; of the second degree. —n. a quadratic polynomial or equation. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: quadratic (Thesaurus) quadrate quadratic equation Related Content Daily Word Quiz: ontiguous Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language