- 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 definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
Math. an expression whose value or sign is used to classify functions
discriminant definition by American Heritage Dictionary
An expression used to distinguish or separate other expressions in a quantity or equation.