here's the root
in the past, women are being treat less equal to men.
So feminist tried to boost women to being *equal* to men. Which is why the definition hold the word "equality" , by making one gender to be equal the other.
However, now, since both genders are about equal. Feminist can't not just change their name into "Equalism" now is it? It's a name that hold for near century. Plus, rape still happened pretty frequent. In some countries, women still being treat less equal. I doubt they gonna change the name anytime soon or never. Equality is, in fact, impossible. Make it as close to equal as possible, but there will still be fighting over it. But remember, none can exist without the other.
However, some feminists went extreme and become misandry. It getting biased and prejudiced. So, in conclusion, there are many type of feminists. In the old definition, it's did aimed for equality.