/ Dictionary / Index Q quadratic equation: Meaning and Definition of Find definitions for: quadrat'ic equa'tion Pronunciation: [key] — Math. Math. an equation containing a single variable of degree 2. Its general form is ax + bx + c = 0, where x is the variable and a, b, and c are constants (a &nE; 0). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. quadratic quadratic form Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language