discrimination

1.  the practice of treating one person or group differently from another in an unfair way:

discrimination against
widespread discrimination against older people in the job market
discrimination in favour of
discrimination in favour of university graduates
racial/sex/religious etc discrimination (=treating someone unfairly because of their race, sex etc)
positive discrimination, reverse discrimination
 
2. the ability to recognize the difference between two or more things, especially the difference in their quality:

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