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# Definition of: quadratic

(kwod·rat**′**ik) adjective **1.** Pertaining to or resembling a square. **2.** Relating to a quadratic equation.

—*noun* Math. **1.** An equation of the second degree. It is a **pure, simple,** or **incomplete quadratic** when it contains only the second power of the variable, as *ax*^{2} + *c* = O; a **complete** or **adfected quadratic** when it contains also the first power, as *ax*^{2} + *bx* + *c* = O. **2.** A formula, *x* , for computing the roots of the standard quadratic equation, *ax*^{2} + *bx* + *c* = O. **3.** *plural* The part of algebra that treats of quadratic equations.