From Longman Dictionary of Contemporary Englishsex discriminationˈsex discrimiˌnation noun [uncountable] treating people unfairly because they are women, or because they are men She is suing the company for sex discrimination.From Longman Business Dictionarysex discriminationˈsex discrimiˌnation (also sexual discrimination)HUMAN RESOURCESLAW when people, especially women, are treated unfairly because of their sex, especially when this stops them getting a job or making progress in their jobSex discrimination in private pension plans is illegal. → discrimination