I have never met a woman who knows what Feminism means.

That is, they are unable to give a functional, working definition of feminism; like one that is used and understood by all feminist authors.

Feminism is a political movement based on the social theory of feminism.

The social theory of feminism states that:

• Society has been constructed by men with the sole purpose of the absolute subjugation of women

• Women (and redress the subjugation) by the use of legal and social change.

There is a little more; specifically about the dependence of women on first their fathers and then their husbands for resources, which feminists see as a form of oppression. The family is oppressive.