Final answer:
Susan Moller Okin defines sexism as the prejudice that values one sex over another, influenced by gender stereotypes and manifesting through institutional discrimination, affecting various aspects of social life and employment.
Step-by-step explanation:
According to Susan Moller Okin, in her work Justice, Gender, and the Family, sexism can be defined as the prejudiced beliefs that value one sex over the other, occurring at individual, group, and institutional levels. Okin's perspective aligns with the feminist understanding that gender stereotypes form the basis of sexism, highlighting the societal expectation for women to adhere to certain roles and behaviors. Institutional discrimination, which is discrimination built into the social structure, is a critical facet of sexism that affects social life, including employment opportunities and promotion prospects in male-dominated industries such as engineering, aviation, and construction.