# Definition of quadratic

**quadratic**Adjective square-shaped**quadratic**Adjective of a polynomial, involving the second power (square) of a variable but no higher powers, as ax^2 + bx + c.**quadratic**Adjective of an equation, of the form ax^2 + bx + c = 0.**quadratic**Adjective of a function, of the form y = ax^2 + bx + c.**quadratic**Noun A quadratic polynomial, function or equation.