An antipathy based on a faulty and inflexible generalization.
Allport, G.W., The Nature of Prejudice. Addison-Wesley Publishing Company, Reading, MA. 1954:9
An aversive or hostile attitude toward a person who belongs to a group, simply because he belongs to that group, and is therefore presumed to have the objectionable qualities ascribed to the group.
Allport, Gordon W. The Nature of Prejudice. 25th Anniversary Edition, Addison-Wesley Publication Company. 1979:7