1. Began to become prominent in the Enlightenment period in the 18th century
2. First wave feminism in the 19th and early 20th centuries focused on legal equality including women's suffrage and property rights
3. Second wave feminism from the 1960s to 1980s expanded the debate to wider issues oppressing women including sexuality, family, the workplace and reproductive rights
4. Third wave feminism in the early 1990s focused on diversity and intersectionality
5. Potential fourth wave feminism in the 2010s defined by use of social media for advocacy and mobilization