The purpose of the article is to analyze and discuss a definition of social oppression proposed by Ann E. Cudd. First, selected ways of understanding social oppression in contemporary philosophy will be characterized. Second, key elements of the definition will be identified. Third, social and normative dimensions of oppression will be examined. Next, material and psychological forces of oppression will be discussed, including violence, the credible threat of violence, economic inequality, rational choices of the oppressed, and psychological harms of oppression. Then, the most important interactions between the forces of oppression will be outlined. Finally, selected advantages and limitations of the definition will be pointed to.