Discrimination is unfair treatment of one particular person or group of people. Discrimination means, at a very basic level, the act of separating out singular things or groups of things.It can be both an adjective and a verb. Discrimination means to act based on a preference or prejudice. Age, race, or gender discrimination. Discrimination happens when people act on their stereotypes or prejudices. For example, if a student is not allowed to go to a school because of his or her race, the school is discriminating against that student. Discrimination means treating some people differently from others. Included in the definition of mark-up in GP-40. Discrimination happens when people act on their stereotypes or prejudices.