What is the definition of feminism?

In the podcast episode on The Lunar Society, Bryan Caplan discusses the evolving definition of feminism. Caplan criticizes the popular dictionary definition, which states that feminism is the theory that women should be the political, social, economic, and cultural equals of men. He argues this definition is inadequate because even many people who do not identify as feminists agree with the equality of women on these fronts.

Caplan suggests a more fitting definition: feminism is the view that society treats women less fairly than men. He believes this distinction better reflects actual usage and public opinion data. According to him, it would be inconsistent for someone to claim they are a feminist while believing men are treated worse than women, and vice versa 1.