Definition of "quadratic"

square-shaped  examples

(mathematics) of a polynomial, involving the second power (square) of a variable but no higher powers, as a x 2 + b x + c .  examples

(mathematics) of an equation, of the form a x 2 + b x + c = 0 .  examples

(mathematics) of a function, of the form y = a x 2 + b x + c .  examples

(mathematics) A quadratic polynomial, function or equation.  examples