 Some philosophers and writers in almost every century, however, constitute forerunners to feminist ethics. Representative authors writing in the seventeenth, eighteenth, and nineteenth centuries discussed below explicitly address what they perceive to be moral wrongs resulting from either oppression on the basis of sex, or metaethical errors on the part of public intellectuals in believing ideal forms of moral reasoning to be within the capacities of men and not women. In the early-to-mid-twentieth century, at the same time that feminism became a more popularly used term in Europe and the Americas, more theorists argued influentially for ending unjust discrimination on the basis of sex. Some authors concertedly argued that philosophers and theorists erred in their understanding of what seemed to be gendered differences in ethical and moral reasoning.