- The definition of a discriminant is some distinguishing characteristic or feature that allows someone or something to be separated from others.
Whether a plant is an annual or a perennial is an example of a discriminant.

## discriminant

noun

Math. an expression whose value or sign is used to classify functions

## discriminant

noun

An expression used to distinguish or separate other expressions in a quantity or equation.

## discriminant

Noun

(*plural* discriminants)

- (algebra) An expression that gives information about the roots of a polynomial; for example, the expression
*D = b*determines whether the roots of the quadratic equation^{2}- 4ac*ax*are real and distinct (^{2}+ bx + c = 0*D*> 0), real and equal (*D*= 0) or complex (*D*< 0).