Well, I don't have the time to research the historical definitions of feminism and present them to you. But I can offer you my own ideas, based on my recent readings. These are the things I like about "feminist" perspectives, anyway. Perhaps the exact definition of the word matters less than how it is used.
I just finished two books on women in Indian cultures. Their role, which they enjoyed and, in fact, resisted changing, even during the eighteenth and early nineteenth century when European settlers crowded them out of their vast territories, was to carry on the family heritage, to provide agricultural services for their tribe and their families, to direct actions of justice via exacting retaliation for any murder of a family member, and to generally support their culture and tribal community. I think their "natural" role shows what women are capable of. I mean, they can have a pretty powerful sway if we allow them, and they could employ their feminine instincts--excuse the cliche term; it's not intended in that way--so that they help to sustain and hold together the community. Their knack for "other-thinking" or selfless-thinking can not only lead to a compassionate attitude and respect toward individuals, but a support of the larger members of the groups to which they belong as well (be they family, work, military, political, etc.). I think that is the gist of it.