What a foolish comment, ironically not 'we'll' clarified either. You've never met a feminism who understands what it is or can define it? Do you think no one on FWR can define it?
Feminism means, to quote Gloria Steinem, whose preferred definition is also mine, 'acknowledging the equality and full humanity of women with men'.
The dictionary definition is "an advocate of women's rights on the basis of the equality of the sexes'.
Obviously like all movements there are different branches & eras : first-wave, second-wave, third-wave in the UK & US, other countries emphasising different aspects, then gender critical vs TWAW, difference feminism vs no-difference, radical vs liberal feminism, 'sex work is work' vs anti-prostitution, lesbian feminism, Catholic feminism, etc Plenty of these groups will disagree with each other on a lot, but they will all affirm that women are equal to men and should be treated as such & will advocate for what they perceive as women's rights issues.
That's not unique. There are Catholics, Protestants, Orthodox Christians, and within those branches like Quakers, Universalists, Calvinists, sedecavantist Catholics, Methodists, Lutherans, Mennonites, Anabaptists etc etc They all, however, share the core belief that Jesus is our Lord and saviour.